Chemistry Homework Help

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Weak Bases

Q. 1. Sodium hypochlorite, NaOCl, is an ingredient of household bleach. Hypochlorous acid, HOCl, has Ka = 3.0 x 10-8 at 25°C. Calculate [OH-], [H3O+], and the pH of a 0.200 M aqueous solution of sodium hypochlorite at 25°C. [OH-] = ______________________ [H3O+] = ______________________ pH = ____

Solved • Apr 13, 2020

Weak Bases

Q. Calculate the pH of a 0.024 mol/L C5H5NHBr (composed of C5H5NH^+ and Br^-) solution. Kb for C5H5N is 1.7 x 10^-9.

Solved • Apr 10, 2020

Weak Bases

Q. Consider the following substances: C6H5NH2 (a weak base), HBH2O2, HC3H5O2, NaNO2, C3H9N. For each compound a. Decide whether the compound behaves as an acid or base in solution b. Write the equation for the dissociation of the compound in water c. Write the equilibrium expression for the dissociation in water

Solved • Apr 7, 2020

Weak Bases

Q. Calculate the pH of a 0.0027 M pyridine (C5H5N) solution. Kb of pyridine is 1.7 x 10−9

Solved • Apr 6, 2020

Weak Bases

Q. What is the concentration of [–OH] in a 0.20 M ammonia solution? (NH3, Kb=1.8 ×10–5)

Solved • Apr 2, 2020

Weak Bases

Q. Nicotine, C10H14N2, is a weak base and has a Kb of 1.0 x 10-6. What is the pH of a 0.20 M solution of nicotine? For full credit, write out the reaction (C10H14N2 (aq) + H2O(l)  …), write out the I.C.E. table beneath it, write the equilibrium constant expression in terms of x, and solve, checking any assumptions (Since it is a basic solution, your pH should be >7).

Solved • Mar 31, 2020

Weak Bases

Q. A 75.0 mL volume of 0.200 M NH3 (Kb = 1.8 x 10^-5) is titrated with 0.500 M HNO3. Calculate the pH after the addition of 25.0 mL of HNO3. Express your answer numerically.

Solved • Mar 24, 2020