Chapter 16, Problem 16.17P

(a)

Interpretation Introduction

Interpretation:

Value of z in the formula ${\text{YBa}}_{\text{2}}{\text{Cu}}_{\text{3}}{\text{O}}_{\text{7}-\text{z}}$ has to be determined.

Concept Introduction:

A superconductor is a material wherein electrical conductivity becomes infinite and from which magnetic flux field is expelled. Superconductor has a critical temperature below which resistance drops abruptly to zero.

Iodometric titration is a type of titration reaction in which iodides reacts with another oxidizing agent in acidic or neutral medium. As a result of this, iodides are converted to iodine and this formed iodine is back titrated against another standard reducing agent (usually sodium thiosulphate) of known concentration.

(b)

Interpretation Introduction

Interpretation:

The uncertainty to find x in the formula ${\text{YBa}}_{\text{2}}{\text{Cu}}_{\text{3}}{\text{O}}_{\text{7}-\text{z}}$ has to be determined.

Concept Introduction:

Refer to part (a).