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311 solutions

Buffer

Q. Select all that apply and explain:-The pH of a buffer solution is always 7.-The pH of a buffer solution depends on the pKa of the acid.-The pH of a...

Solved • Mar 30, 2020

Buffer

Q. What is the ratio of [A–]/[HA] at pH 5.75? The pKa of formic acid (methanoic acid, H–COOH) is 3.75.Draw the structure for formic acid.Draw the stru...

Solved • Mar 25, 2020

Buffer

Q. How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?a) 2.13 times moreb) 5.75 times morec) 0.47 time...

Solved • Mar 20, 2020

Buffer

Q. Which of the following buffer systems would be the best choice to create a buffer with pH = 7.3?Part AAnswer: HClO/KClOFor the best system, calcula...

Solved • Mar 20, 2020

Buffer

Q. Which of the following mixtures may be act as a buffer solution?A) HBr, NaBrB) HF, NaFC) HCl, NaClD) HI, NaI

Solved • Mar 20, 2020

Buffer

Q. Which of the following would occur if solid NH4Cl was added to an aqueous solution of NH3? The pH decreases. The equilibrium constant changes. The ...

Solved • Mar 18, 2020

Buffer

Q. Which of the following are valid ways to make an ammonia/ammonium buffer for use in a laboratory? Explain your choices. a) Mix equal volumes of 1 M...

Solved • Mar 17, 2020

Buffer

Q. AcidKaCBKbH2CO34.2 x 10-7HCO3-2.4 x 10-8HCO3-4.8 x 10-11CO32-2.1 x 10-4You are to prepare a "carbonate" buffer with pH of 10.35. You are given carb...

Solved • Mar 13, 2020

Buffer

Q. What is the pH of a solution that has an acetic acid concentration of 0.050 M and a sodium acetate concentration of 0.075 M?A 4.92B. 9.30C. 7.50D. ...

Solved • Feb 17, 2020

Buffer

Q. Which of the following statements regarding the Henderson-Hasselbalch (HH) equation are correct?I The HH equation is pH = pKa + log II The HH equat...

Solved • Feb 17, 2020

Buffer

Q. Which of the following statements regarding pH buffers are correct?I A pH buffer is an aqueous solution in which the pH changes less, upon adding a...

Solved • Feb 17, 2020

Buffer

Q. The capacity of a buffer is greatest when which of the following is true?A. [weak acid] > [its conjugate base]B. [weak acid] = [its conjugate ba...

Solved • Feb 10, 2020

Buffer

Q. Which of the following is a true statement about aqueous solutions containing a buffer?A. a buffer resists pH change caused by adding acid or baseB...

Solved • Feb 10, 2020

Buffer

Q. Given the following information:H3PO4              Ka1 = 7.5 x 10-3                      H2SO4                  Ka1 is large                       ...

Solved • Feb 10, 2020

Buffer

Q. Which of the following combinations would be a buffer?W. 1.0 mol NaCl + 1.0 mol HCl in 1.00 liter solutionX. 1.0 mol KNO3 + 1.0 mol HNO3 in 1.00 li...

Solved • Feb 7, 2020

Buffer

Q. What mass of sodium hypochlorite, NaOCl (molar mass 74.5 g/mol), must be added to 250 mL of 0.60 M HClO (hypochlorous acid, Ka = 3.5 x 10-8), in or...

Solved • Feb 7, 2020

Buffer

Q. Potassium fluoride (100 mL of a 0.4 M solution) was mixed with hydrofluoric acid (100 mL of a 0.4 M solution). What was the resulting pH? If 100 mL...

Solved • Feb 6, 2020

Buffer

Q. A buffer solution is prepared by mixing 150 mL of 0.100 M propionic acid (HC3H5O2, Ka = 1.3 x 10-5) and 400 mL of 0.0650 M potassium propionate. Wh...

Solved • Jan 27, 2020

Buffer

Q. A buffer that contains 0.13 M of an acid, HA and 0.33 M of its conjugate base A-, has a pH of 4.27. What is the pH after 0.012 mol of NaOH are adde...

Solved • Dec 19, 2019

Buffer

Q. A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10 -5 A. 8.09B. 9.42C. 4.56D....

Solved • Dec 19, 2019

Buffer

Q. A buffer solution is prepared that is 0.24 M NH3 and 0.16 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5a. 10.22b. 9.43c. 8.78d. ...

Solved • Dec 19, 2019

Buffer

Q. Paracresol (C7H8OH) has a Ka = 5.5 x 10-11. If 100.0 mL of a 0.5000 M aqueous paracresol solution is mixed with 100.0 mL of 0.5000 M aqueous sodium...

Solved • Dec 18, 2019

Buffer

Q. Calculate the pH of a solution formed by mixing 100.0 mL of 0.100 M NaF and 100.0 mL of 0.060 M HCl. Ka of HF = 7.24 x 10-4.a. 2.96b. 4.68c. 3.32d....

Solved • Dec 18, 2019

Buffer

Q. What will happen if a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on NH3?a. The percent ionization of NH3 will increas...

Solved • Dec 18, 2019

Buffer

Q. The pH of 0.50 M HClO is 3.91. Calculate the change in pH when 1.68 g of NaClO (FW = 74.44 g/mol) is added to 47 mL of 0.50 M HClO (FW = 52.46 g/mo...

Solved • Dec 18, 2019

Buffer

Q. Calculate the pH of a solution that is 1.00 M HF and 0.20 M KF. Ka = 7.24 x 10-4a. 2.44b. 3.84c. 0.70d. 3.14e. 2.84

Solved • Dec 18, 2019

Buffer

Q. What will happen is a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on HF?a. The percent ionization of HF will increase....

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH when 1.11 g of CH3COONa (FW = 82.03 g/mol) is added to 41 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka...

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH of a solution that is 0.242 M C6H5COOH and 0.183 M C6H5COONa. Ka of C6H5COOH is 6.5 x 10-5.a. 2.77b. 5.81c. 4.31d. 4.07e. 6.19

Solved • Dec 17, 2019

Buffer

Q. Calculate the pH when 0.98 g of CH3COONa (FW = 82.03 g/mol) is added to 38 mL of 0.500 M acetic acid, CH3COOH. Ignore any changes in volume. The Ka...

Solved • Dec 12, 2019

Buffer

Q. Calculate the pH of a solution that is 0.111 M CH3COOH and 0.558 M CH3COONa. Ka of CH3COOH is 1.8 x 10-5.a. 5.45b. 5.02c. 5.67d. 6.91e. 6.82

Solved • Dec 12, 2019

Buffer

Q. What will happen if a small amount of hydrochloric acid is added to a 0.1 M ideal buffer based on HF?

Solved • Dec 12, 2019

Buffer

Q. The pH of 0.50 M HClO is 3.91.  Calculate the change in pH when 1.68 g of NaClO (FW = 74.44 g/mol) is added to 31 mL of 0.50 M HClO (FW = 52.46 g/m...

Solved • Dec 12, 2019

Buffer

Q. Calculate the pH of a solution that is 0.559 M HBrO and 0.14 M NaBrO.Ka of HBrO is 2.0 x 10-9.

Solved • Dec 12, 2019

Buffer

Q. A solution with a volume of 1.00 L is 0.450 M in CH3COOH(aq) and 0.350 M in CH3COONa(aq). What will the pH be after 0.0800 mol of HCl is added to t...

Solved • Nov 12, 2019

Buffer

Q. What substance would you add to NaHCO3(aq) to form a buffer solution?

Solved • Sep 3, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.36 M calcium perchlorate + 0.20 M potassium perchlo...

Solved • Aug 29, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.19 M barium hydroxide + 0.29 M barium bromide0.28 M...

Solved • Aug 29, 2019

Buffer

Q. Which of the following aqueous solutions are good buffer systems? [YOU CAN PICK MORE THAN ONE]0.31 M ammonium bromide + 0.32 M ammonia0.21 M hypoch...

Solved • Aug 29, 2019

Buffer

Q. CH3COOH + H2O ⇌Calculate the pH of a solution that is 1.00 M CH 3COOH (Ka = 1.8 x 10 -5) and 1.00 M CH 3COONa.

Solved • Aug 25, 2019

Buffer

Q. What is the pH of a buffer solution that is 0.24 M NH 3 and 0.20 M NH4Cl?

Solved • Aug 25, 2019

Buffer

Q. How do you calculate the change in pH when 3.00 mL of 0.100 M   HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0....

Solved • Aug 7, 2019

Buffer

Q. A 1.50 L buffer solution is 0.250 M HF and 0.250 M NaF. What is the pH of the solution after the addition of 0.0500 moles of solid NaOH? Assume no ...

Solved • Aug 7, 2019

Buffer

Q. You need to prepare 100.0mL of a pH = 4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each so...

Solved • Aug 7, 2019

Buffer

Q. Using the equation pH = pKa + log{ [A-] / [HA] } and the graph, provide an estimate of the pKa of the acid using data from points A, B, and C. Repo...

Solved • Aug 6, 2019

Buffer

Q. What would be the pH of a buffer that is 1.5 M in H 2CO3 and 1.0 M in NaHCO3?

Solved • Aug 5, 2019

Buffer

Q. How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?a. 2.13 times moreb. 5.75 times morec. 0.47 time...

Solved • Jul 10, 2019

Buffer

Q. Part A. 75.0 mL of 0.10 M HF; 55.0 mL of 0.15 M NaFa. this will be a bufferb. this will not be a bufferPart B. 150.0 mL of 0.10 M HF; 135.0 mL of 0...

Solved • Jul 10, 2019

Buffer

Q. During exercise when the body lacks an adequate supply of oxygen to support energy production, the pyruvate that is produced from the breakdown of ...

Solved • Jul 10, 2019

Buffer

Q. What is the pH of a buffer that is 0.6 M HF and 0.2 M NaF? The Ka of HF is 6.8 × 10−4.a. 3.65b. 2.69c. 3.17d. 3.50

Solved • Jul 9, 2019

Buffer

Q. H2CO3 is a diprotic acid. The pKa for H2CO3 is 6.35, and the pKa for HCO3- is 10.33. At pH = 7.2 what is the "approximate" relative quantities of H...

Solved • Jul 9, 2019

Buffer

Q. Acetic acid has a pKa of 4.74. A sodium acetate/ acetic acid buffer (CH3CO2Na / CH3CO2H) with a pH of 4.74 can be made by:a. Combining 0.10 mole of...

Solved • Jul 9, 2019

Buffer

Q. Calculate the number of grams of ammonium chloride that must be added to 2.00 L of a 0.500 M ammonia solution to obtain a buffer of pH = 9.20. Assu...

Solved • Jan 3, 2019

Buffer

Q. A biochemist needs 750 mL of an acetic acid-sodium acetate buffer with exttip{pH}{pH} = 4.55. Solid sodium acetate (CH3 COONa) and glacial acetic...

Solved • Jan 3, 2019

Buffer

Q. You are asked to prepare a pH = 3.00 buffer solution starting from 1.25 L of a 1.00 M solution of hydrofluoric acid (HF) and an excess of sodium fl...

Solved • Jan 3, 2019

Buffer

Q. You are asked to prepare a pH = 3.00 buffer solution starting from 1.25 L of a 1.00 M solution of hydrofluoric acid (HF) and an excess of sodium fl...

Solved • Jan 3, 2019

Buffer

Q. A buffer contains 0.16 mol of propionic acid (C2H5COOH) and 0.22 mol of sodium propionate (C2H5COONa) in 1.20 L.What is the pH of the buffer after ...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 5.05 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN.Which s...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 5.05 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN.How man...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a solution formed by mixing 65 mL of a solution that is 0.26 M in NaHCO3 with 75 mL of a solution that is 0.21 M in Na2CO3.

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of this buffer?

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of the buffer after the addition of 0.03...

Solved • Jan 3, 2019

Buffer

Q. A buffer solution contains 0.11 mol of acetic acid and 0.14 mol of sodium acetate in 1.00 L.What is the pH of the buffer after the addition of 0.03...

Solved • Jan 3, 2019

Buffer

Q. What is the ratio of HCO3- to H2CO3 in blood of pH 7.4?

Solved • Jan 3, 2019

Buffer

Q. What is the ratio of HCO3- to H2 CO3 in an exhausted marathon runner whose blood pH is 7.2?

Solved • Jan 3, 2019

Buffer

Q. A buffer, consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system.Wh...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.W...

Solved • Jan 3, 2019

Buffer

Q. You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.H...

Solved • Jan 3, 2019

Buffer

Q. Calculate the percent ionization of 0.0080 M butanoic acid in a solution containing 0.080 M sodium butanoate.

Solved • Jan 3, 2019

Buffer

Q. Calculate the percent ionization of 0.130 M lactic acid in a solution containing 8.0×10−3  M sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. If solutions of NH4Cl(aq) and NH3(aq) are mixed, which ions in the resulting solution are spectator ions in any acid-base chemistry occurring in th...

Solved • Jan 3, 2019

Buffer

Q. Use information from Appendix D in the textbook to calculate the pH of the following solutions.Calculate the pH of a solution that is 0.260 M in so...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer that is 0.13 M in lactic acid and 0.11 M in sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer formed by mixing 85 mL of 0.13 M lactic acid with 95 mL of 0.16 M sodium lactate.

Solved • Jan 3, 2019

Buffer

Q. Use information from Appendix D in the textbook to calculate the pH of the following solutions.Calculate the pH of a solution that is 0.080 M in tr...

Solved • Jan 3, 2019

Buffer

Q. Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb= 4.75. Calculate the pH of 1.0 L upon addition of 0.110 mol ...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of a buffer solution that is 0.251 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9×10−10 (pKa = 9.31).

Solved • Jan 3, 2019

Buffer

Q. A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2. The value of Ka for HC2H3O2 is 1.8 x 10–5. Calculate the pH of the solut...

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of the solution that results from each of the following mixtures: 160.0 mL of 0.26 M HF with 230.0 mL of 0.32 M  NaF

Solved • Jan 3, 2019

Buffer

Q. A 120.0 -mL buffer solution is 0.110 M in NH3 and 0.135 M in NH4Br. What mass of HCl can this buffer neutralize before the pH falls below 9.00?    ...

Solved • Jan 3, 2019

Buffer

Q. A 120.0-mL buffer solution is 0.110 M in NH3 and 0.135 M in NH4Br. If the same volume of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what ...

Solved • Jan 3, 2019

Buffer

Q. Consider a buffer composed of the weak acid HA and its conjugate base A–. Which pair of concentrations results in the most effective buffer?a) 0.10...

Solved • Jan 3, 2019

Buffer

Q. Which combination is the best choice to prepare a buffer with a pH of 9.0?a) NH3; NH4Cl (pKb for NH3 is 4.75)b) C5H5N; C5H5NHCl (pKb for C5H5N is 8...

Solved • Jan 3, 2019

Buffer

Q. A buffer contains 0.10 mol of a weak acid and 0.20 mol of its conjugate base in 1.0 L of solution. Determine whether or not adding 0.020 mol of NaO...

Solved • Jan 3, 2019

Buffer

Q. What is the pH of a buffer that is 0.120 M in formic acid (HCHO2) and 0.080 M in potassium formate (KCHO2)? For formic acid, Ka = 1.8 x 10–4.

Solved • Jan 3, 2019

Buffer

Q. A buffer with a pH of 9.85 contains CH3NH2 and CH3NH3Cl in water. What can you conclude about the relative concentrations of CH3NH2 and CH3NH3Cl in...

Solved • Jan 3, 2019

Buffer

Q. A 500.0 mL buffer solution is 0.10 M in benzoic acid and 0.10 M in sodium benzoate and has an initial pH of 4.19. What is the pH of the buffer upon...

Solved • Jan 3, 2019

Buffer

Q. The Kb of hydroxylamine, NH2 OH, is 1.10 x 10–8. A buffer solution is prepared by mixing 120 mL of a 0.37 M hydroxylamine solution with 60 mL of a ...

Solved • Jan 3, 2019

Buffer

Q. A buffer is created by combining 160.0 mL of 0.30 M HCHO2 with 80.0 mL of 0.25 M NaOH. Determine the pH of the buffer.

Solved • Jan 3, 2019

Buffer

Q. Blood is buffered by carbonic acid and the bicarbonate ion. Normal blood plasma is 0.024 M in HCO3– and 0.0012 M H2CO3 (pKa1 for H2 CO3 at body tem...

Solved • Jan 3, 2019

Buffer

Q. The fluids within cells are buffered by H2PO4– and HPO42–. Could a buffer system employing H3PO4 as the weak acid and H2PO4– as the weak base be us...

Solved • Jan 3, 2019

Buffer

Q. A 500.0-mL buffer solution is 0.100 M in HNO2 and 0.150 M in KNO2. Determine whether or not 250 mg NaOH would exceed the capacity of the buffer to ...

Solved • Jan 3, 2019

Buffer

Q. A 500.0-mL buffer solution is 0.100 M in HNO2 and 0.150 M in KNO2. Determine whether or not 1.35 g HI would exceed the capacity of the buffer to ne...

Solved • Jan 3, 2019

Buffer

Q. A 1.0-L buffer solution is 0.125 M in HNO2 and 0.175 M in NaNO2. Determine the concentrations of HNO2 and NaNO2 after addition of 1.6 g HCl.

Solved • Jan 3, 2019

Buffer

Q. A 260.0 mL buffer solution is 0.260 M in acetic acid and 0.260 M in sodium acetate. What is the pH after addition of 0.0150 mol of HCl?

Solved • Jan 3, 2019

Buffer

Q. Calculate the pH of the solution that results from each of the following mixtures.55.0 mL of 0.17 M HCHO2 with 80.0 mL of 0.13 M NaCHO2

Solved • Jan 3, 2019

Buffer

Q. What mass of sodium benzoate should be added to 160.0 mL of a 0.16 M benzoic acid solution in order to obtain a buffer with a pH of 4.30?

Solved • Jan 3, 2019

Buffer

Q. Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution:a solution that is 0.225 M in CH3NH2 and 0.120 M in CH3NH3Br

Solved • Jan 3, 2019

Buffer

Q. A buffer contains significant amounts of ammonia and ammonium chloride.Write an equation showing how this buffer neutralizes added acid (HCl).

Solved • Jan 3, 2019

Buffer

Q. A formic acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition?a. HClb. NaBrc. NaCHO2d. KCl

Solved • Jan 3, 2019