Chapter 9, Problem 6STP

Interpretation Introduction

Interpretation:

The visible reaction that takes place when aqueous solution of nickel (II) sulfate is mixed with aqueous sodium hydroxide needs to be explained.

Concept introduction:

The precipitation reaction is the double displacement reaction which occurs when two aqueous solutions that contain ions as solutes are combined; the ions might react with one another.

Answer to Problem 6STP

Option D is correct.

Explanation of Solution

Reason for correct option:

When aqueous solution of nickel (II) sulfate is combined with aqueous sodium hydroxide the reaction is as follows:

${\text{NiSO}}_{\text{4}}\left(\text{aq}\right)\text{+2NaOH}\left(\text{aq}\right)\to \text{Ni}{\left(\text{OH}\right)}_{\text{2}}\left(\text{s}\right){\text{+Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(\text{aq}\right)$

From the table, the product nickel (II) hydroxide is an insoluble solid. Therefore, the reaction will occur and nickel (II) hydroxide is precipitate out.

Conclusion

Reason for incorrect option:

Option A is incorrect as nickel (II) hydroxide is insoluble in water.

Option B is not correct as sodium sulfate is soluble in water so, it is not precipitate out.

Option C is also incorrect because sodium sulfate is soluble in water so, it is not precipitate out of the solution.