Chapter 9, Problem 8STP

Interpretation Introduction

Interpretation:

The correct equation needs to be identified.

Concept introduction:

The precipitation reaction is the double displacement reaction which occurs when reaction between two aqueous solutions containing ions takes place, in which reaction of ions may takes place and a compound insoluble in solvent is formed.

Answer to Problem 8STP

Option B is correct.

Explanation of Solution

Reason for correct option:

From the table it is clear that $\text{Ni}{\left(\text{OH}\right)}_{\text{2}}$ is insoluble in water. It sinks to the bottom of the beaker if HCl is added then $\text{Ni}{\left(\text{OH}\right)}_{\text{2}}$ is completely disappear from the solution.

The reaction between $\text{Ni}{\left(\text{OH}\right)}_{\text{2}}$ and HCl is as follows:

$\text{Ni}{\left(\text{OH}\right)}_{\text{2}}\left(\text{s}\right)\text{+2HCl}\left(\text{aq}\right)\to {\text{NaCl}}_2\left(\text{aq}\right)+{\text{2H}}_{\text{2}}\text{O}\left(\text{l}\right)$

Conclusion

Reason for incorrect option:

Option A is incorrect because nickel (II) hydroxide combined with HCl and produce ${\text{NaCl}}_2$ and water.

Option C is not correct because the question asked about the reaction between nickel (II) hydroxide and HCl not water.

Option D is also incorrect because the question asked about the reaction between nickel (II) hydroxide and HCl not water.