Answered: PROBLEM 1. What will be the pH when…

PROBLEM 1. What will be the pH when 50.0 ml of 2.00M carbonic acid is mixed 20.0 ml of 3.00 M sodium bicarbonate? The Ka of carbonic is 4.30 x 10-7

Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter25: Ph Measurements-buffers And Their Properties

Section: Chapter Questions

Problem 5ASA

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Question

PROBLEM 1. What will be the pH when 50.0 ml of 2.00M carbonic acid is mixed 20.0 ml of 3.00 M sodium bicarbonate? The K_a of carbonic is 4.30 x 10^-7.

PROBLEM 2. For the buffer in Problem no. 1, what will be the pH when (a) 15.0 ml of 0.500 M HCl and (b) when 15.0 ml of 0.750 M NaOH is added to the buffer separately?

PROBLEM 3. How will you prepare 500 ml of 0.750 M citrate buffer with pH of 4.25 from solid citric acid (C₆H₈O₇) and solid sodium citrate (Na₃ C₆H₅O₇)? The Ka of citric acid is 7.40 x 10^-4.

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