Answered: You find 425.0 mLof 0.350 M sodium…

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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Question

You find 425.0 mLof 0.350 M sodium oxalate in the lab, and you want to use it to make a buffer with a pH of 1.50. What mass of oxalic acid (MW = 90.03 g/mol, Ka= 5.9 × 10–2) is needed to make this buffer? (Neglect any volume changes due to the addition of solid oxalic acid.)

Expert Solution

Step 1

Volume of sodium oxalate = 425 mL or 0.425 L

Molarity of sodium oxalate = 0.350 M

$\begin{array}{rcl} Moles of sodium oxalate & = & Molarity \times Volume \\ = & 0.350 M \times 0.425 mL \\ = & 0.14875 moles \end{array}$

Step 2

pH = 1.5

K_a = 5.9 × 10^-2

^{$\begin{array}{rcl} {pK}_{a} & = & - \log K_{a} \\ = & - \log (5.9 \times 10^{- 2}) \\ = & 1.229 \end{array}$}

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