Answered: A buffer solution is made that is 0.485…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A buffer solution is made that is 0.485 M in HNO₂ and 0.485 M in NaNO₂ .

(a) If K_a for HNO₂ is 4.50×10^-4, what is the pH of the buffer solution? _______

(b) Write the net ionic equation for the reaction that occurs when 0.107 mol NaOH is added to 1.00 L of the buffer solution.

_____ + ______ ----->______ + ______

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Solution -

According to the question -

Given -

From Henderson-Hasselbalch equation of acidic buffer we know,

$pH=pK_a+\frac{[salt]}{[acid]}$

pH = - log [H+], pKa = - log Ka, [salt] = [NaNO2] = 0.485 M and [acid] = [HNO2] = 0.485 M.

So, from the equation,

$pH=-log\, (4.50\times 10^{-4})+\frac{0.485\, M}{0.485\, M}=3.35$

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