Chapter 4, Problem 4.115SP

(a)

Interpretation Introduction

Interpretation:

The precipitation, acid-base and redox processes discussed in the method of obtaining magnesium from seawater have to be identified.

Concept Introduction:

Redox reaction:

• The chemical reaction in which, oxidation reaction and reduction reaction always occurs together and are called  oxidation reduction reaction, abbreviated as redox reaction.

Acid -Base reaction:

• The reaction between acid and base to produce a salt is called acid-base reaction.

Precipitation reaction:

• If precipitate is formed, when the two solutions are mixed together is called precipitation reaction.

(b)

Interpretation Introduction

Interpretation:

The reason for using $CaO$ to precipitate magnesium hydroxide has to be discussed.

Concept Introduction:

Redox reaction:

• The chemical reaction in which, oxidation reaction and reduction reaction always occurs together and are called  oxidation reduction reaction, abbreviated as redox reaction.

Acid -Base reaction:

• The reaction between acid and base to produce a salt is called acid-base reaction.

Precipitation reaction:

• If precipitate is formed, when the two solutions are mixed together is called precipitation reaction.

(c)

Interpretation Introduction

Interpretation:

Reason for using dolomite to bring about a precipitation reaction has to be explained.

Concept Introduction:

Redox reaction:

• The chemical reaction in which, oxidation reaction and reduction reaction always occurs together and are called  oxidation reduction reaction, abbreviated as redox reaction.

Acid -Base reaction:

• The reaction between acid and base to produce a salt is called acid-base reaction.

Precipitation reaction:

• If precipitate is formed, when the two solutions are mixed together is called precipitation reaction.

(d)

Interpretation Introduction

Interpretation:

Reason for mining of magnesium takes place from ocean rather than earth crust has to be explained.

Concept Introduction:

Redox reaction:

• The chemical reaction in which, oxidation reaction and reduction reaction always occurs together and are called  oxidation reduction reaction, abbreviated as redox reaction.

Acid -Base reaction:

• The reaction between acid and base to produce a salt is called acid-base reaction.

Precipitation reaction:

• If precipitate is formed, when the two solutions are mixed together is called precipitation reaction.