Chapter 8, Problem 54CE

(a)

Interpretation Introduction

Interpretation:

The type of reaction that occur between mercury (II) nitrate and potassium iodide has to be written.

Concept Introduction:

Double displacement reactions:  This type of reactions occurs when the cation and the anions switch between two reactants to form new products.  In order for the reaction to occur, one of the products is usually a solid precipitate, a gas or a molecular compound.

Example:  The product of the reaction between nitric acid and calcium sulphide is gaseous hydrogen sulphide and calcium nitrate.  The completed equation is,

  $\text{CaS}\left(\text{s}\right){\text{+2HNO}}_{\text{3}}\left(\text{aq}\right)\stackrel{}{\to }\text{Ca}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}\left(\text{aq}\right){\text{+H}}_{\text{2}}\text{S}\left(\text{g}\right)$

(b)

Interpretation Introduction

Interpretation:

The name and formula of the solid product has to be given.