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Acid Base Indicators Solutions Library

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Acid Base Indicators

Q. Methyl orange, HMO, is a common acid-base indicator. Insolution it ionizes according to the equation:                                              ...

Solved • Mar 31, 2020

Acid Base Indicators

Q. In which titration would you use an indicator having Ka = 1 x 10-5 ?X. HCN titrated with NaOHY. CH3COOH titrated with NaOHZ. NH3 titrated with HClA...

Solved • Feb 6, 2020

Acid Base Indicators

Q. A 0.70 g sample of a weak monoprotic acid was dissolved in 150 mL of water and titrated with a 0.055 M solution of KOH at 25°C. At the half-equival...

Solved • Dec 20, 2019

Acid Base Indicators

Q. The beaker on the right contains 0.1 M acetic acid solution with methyl orange as an indicator. The beaker on the left contains a mixture of 0.1 M ...

Solved • Jan 3, 2019

Acid Base Indicators

Q. The beaker on the right contains 0.1 M acetic acid solution with methyl orange as an indicator. The beaker on the left contains a mixture of 0.1 M ...

Solved • Jan 3, 2019

Acid Base Indicators

Q. The acid-base indicator bromcresol green is a weak acid. The yellow acid and blue base forms of the indicator are present in equal concentrations i...

Solved • Jan 3, 2019

Acid Base Indicators

Q. The samples of nitric and acetic acid shown here are both titrated with a 0.100 M solution of NaOH(aq).Determine whether each of the following stat...

Solved • Jan 3, 2019

Acid Base Indicators

Q. A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalen...

Solved • Jan 3, 2019

Acid Base Indicators

Q. Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form.If 0.120 M NaOH is slowly added to the HCl sample, in what pH ...

Solved • Jan 3, 2019

Acid Base Indicators

Q. Solutions containing three common acid-base indicators at various pH values. Which of these indicators is best suited to distinguish ...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Effect of cations on solution pH.The pH values of 1.0 M solutions of four nitrate salts are estimated using acid-base indicators.Why do we need to ...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Addition of the indicator methyl orange to an unknown solution leads to a yellow color. The addition of bromthymol blue to the same solution also l...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Addition of the indicator methyl orange to an unknown solution leads to a yellow color. The addition of bromthymol blue to the same solution also l...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Addition of the indicator methyl orange to an unknown solution leads to a yellow color. The addition of bromthymol blue to the same solution also l...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition of bromthymol blue to the same solution le...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Addition of phenolphthalein to an unknown colorless solution does not cause a color change. The addition of bromthymol blue to the same solution le...

Solved • Dec 13, 2018

Acid Base Indicators

Q. pH ranges for common acid-base indicators. Most indicators have a useful range of about 2 pH units.If a colorless solution turns pink when we ad...

Solved • Dec 13, 2018

Acid Base Indicators

Q. The indicator methyl orange has been added to both of these solutions. Based on the colors, classify each statement as true or false.The pH of solu...

Solved • Dec 13, 2018

Acid Base Indicators

Q. Use Figure 19.9 to find an indicator for these titrations: (a) 0.25 M C6H5COOH (see Appendix C) with 0.25 M KOH

Solved • Nov 20, 2018

Acid Base Indicators

Q. Use Figure 19.9 to find an indicator for these titrations:(a) 0.5 M (CH3)2NH (see Appendix C) with 0.5 M HBr

Solved • Nov 20, 2018

Acid Base Indicators

Q. Use Figure 19.9 to find an indicator for these titrations:(b) 0.50 M HI with 0.10 M KOH

Solved • Nov 20, 2018

Acid Base Indicators

Q. Use Figure 19.9 to find an indicator for these titrations:(a) 0.10 M CH3NH2 (see Appendix C) with 0.10 M HCl

Solved • Nov 20, 2018

Acid Base Indicators

Q. The indicator cresol red has Ka = 3.5 × 10−9. Over what approximate pH range does it change color?

Solved • Nov 20, 2018

Acid Base Indicators

Q. Estimate the pH of a solution in which crystal violet is yellow and methyl orange is red. (See Fig. 14‑8.)

Solved • Nov 7, 2018

Acid Base Indicators

Q. Estimate the pH of a solution in which bromcresol green is blue and thymol blue is yellow. (See Fig. 14‑8.)

Solved • Nov 7, 2018

Acid Base Indicators

Q. Which of the indicators in Fig. 14‑8 could be used for the titrations of the following: •For the titration of 25.0 mL of 0.100 M propanoic acid (HC...

Solved • Nov 7, 2018

Acid Base Indicators

Q. A certain indicator HIn has a pKa of 3.00 and a color change becomes visible when 7.00% of the indicator has been converted to In-. At what pH is t...

Solved • Nov 7, 2018

Acid Base Indicators

Q. Potassium hydrogen phthalate, known as KHP (molar mass = 204.22 g/mol), can be obtained in high purity and is used to determine the concentration o...

Solved • Nov 7, 2018

Acid Base Indicators

Q. Methyl red has the following structure:It undergoes a color change from red to yellow as a solution gets more basic. Calculate an approximate pH ra...

Solved • Nov 7, 2018

Acid Base Indicators

Q. Two drops of indicator HIn (K a = 1.0 x 10 -9), where HIn is yellow and In- is blue, are placed in 100.0 mL of 0.10 M HCl. b. The solution is titra...

Solved • Nov 7, 2018

Acid Base Indicators

Q. The indicator dinitrophenol is an acid with a Ka of 1.1 × 10 −4. In a 1.0 × 10 −4-M solution, it is colorless in acid and yellow in base. Calculate...

Solved • Nov 7, 2018

Acid Base Indicators

Q. You have three solutions: HI(ag), HCN(ag), and KOH(ag), but you don't know which is which, so you test each with litmus paper. In addition, you use...

Solved • Jul 11, 2018

Acid Base Indicators

Q. A certain indicator, HA, has a Ka value of 1.6 times 10-6. The protonated form of the indicator is yellow and the ionized form is red. What is the ...

Solved • May 12, 2018

Acid Base Indicators

Q. The titration shown here has an equivalence point at pH = 3.2. Identify which of the following indicators would be appropriate for this titration. ...

Solved • Mar 21, 2018

Acid Base Indicators

Q. Pyradine (C6H5N) is a weak organic base with a K b of 1.7x10-9. Suppose you were to titrate 25.0 mL of a 0.100 M aqueous solution of pyridine with ...

Solved • Dec 26, 2016

Acid Base Indicators

Q. An indicator changes from red to blue going from its acidic (nonionized) form to its basic (ionized) form. The indicator has a Ka of 3.2 × 10−5 . W...

Solved • Sep 21, 2016

Acid Base Indicators

Q. You have a colorless solution in a beaker. To identify it you try to see if it will conduct electricity and you find that it does. Next, you place ...

Solved • Sep 21, 2016

Acid Base Indicators

Q. Consider the acid-base indicator, HIn, featured below: Hln (aq) +   H2O (l) ⇌ In– (aq) + H3O+ (aq)         K a = 1.0 x 10–4 (yellow)              ...

Solved • May 17, 2016

Acid Base Indicators

Q. Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid solution with 0.10 M KOH(aq)? For lactic acid, pKa...

Solved • Apr 18, 2016

Acid Base Indicators

Q. Bromocresol green, Ka = 2.0 x 10 -5, is yellow in its protonated form (HX) and blue in its ionized form (X-).  a) At what pH will bromocresol gree...

Solved • Apr 15, 2016

Acid Base Indicators

Q. You are titrating a weak acid (pKa = 5.00) with a strong base. Which of the following indicators would likely be best for determining the “end poin...

Solved • Feb 21, 2016

Acid Base Indicators

Q. Which of the following would be the best indicator for the titration of a strong base with a strong acid? a) methyl violet (color change at pH = 0...

Solved • Feb 21, 2016