Chapter 13, Problem 13.26P

Interpretation Introduction

Interpretation:

Grams of ${\text{Na}}_{\text{2}}{\text{H}}_{\text{2}}\text{EDTA}\cdot {\text{2H}}_2\text{O}$ required to mix with $1.95\text{ g}$ of $\text{Ca}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}\cdot 2{\text{H}}_{\text{2}}\text{O}$ in $500\text{ mL}$ volumetric flask to give buffer with ${\text{pCa}}^{2+}$ of 9.00 at $\text{pH 9}\text{.00}$ have to be determined.

Concept Introduction:

EDTA or ethylenediaminetetraacetic acid is used for titration of majority of metals with help of formation of strong metal complexes in the ratio of $1:1$. It is utilized to bind metals, most commonly used in industrial processes. It is also used for prevention of food oxidation and in environmental chemistry.

Formula to calculate molarity of solution is as follows:

  $\text{Molarity of solution}\left(\text{M}\right)=\frac{\text{Moles of solute}}{\text{Volume }\left(\text{L}\right)\text{ of solution}}$        (1)