Follow the approach described in Exercise 101 for 1.0 x 10 -6 M HCl(aq) to verify the
Question:
Follow the approach described in Exercise 101 for 1.0 x 10-6 M HCl(aq) to verify the claim that the self-ionization of water contributes less than 1% to the total amount of H3O+ in solution.
Exercise 101
In this problem, we will use material balance and charge balance concepts to calculate the equilibrium concentrations in an extremely dilute solution of a strong acid, 1.0 x 10-7 M HCl(aq).
(a) Write down the material balance equation for 1.0 x 10-7 M HCl(aq), assuming that HCl ionizes completely in aqueous solution.
(b) Write down the charge balance equation (an electroneutrality condition) for this solution.
(c) Use the material balance and charge balance equations, and the ion product for water, Kw = [H3O+][OH-], to show that [H3O+]2 - co[H3O+] - Kw = 0, where co = 1.0 x 10-7 M.
(d) Use the quadratic formula to solve the equation in (c) for [H3O+].
(e) Calculate [OH-] and compare this value with [Cl-].
What conclusion can you draw from this comparison?
Step by Step Answer:
General Chemistry Principles And Modern Applications
ISBN: 9780132931281
11th Edition
Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette