Chapter 13, Problem 13.10P

(a)

Interpretation Introduction

Interpretation:

Total millimoles of metal ions in unknown 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)

(b)

Interpretation Introduction

Interpretation:

Millimoles of ${\text{Hg}}^{2+}$ in unknown 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)

(c)

Interpretation Introduction

Interpretation:

Expected colors before addition of ${\text{Zn}}^{2+}$ in first titration, at first end point, after addition of excess $\text{KI}$ and at second end point 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. It can be used either directly or indirectly for analysis of most of the elements present in periodic table. EDTA titrations can be performed in many ways. Some of these are mentioned below.

1. Direct titration

2. Back titration

3. Displacement titration

4. Masking