Chapter 19, Problem 4STP

To determine

To find: The substance which is the precipitate in the given chemical reaction.

Answer to Problem 4STP

The right answer is potion C- ${\text{BaSO}}_{\text{4}}$ .

Explanation of Solution

Introduction:

Precipitation is the process in which a solid insoluble substance is formed from the solution during the chemical reaction.

The given chemical reaction is,

  $\text{Ba}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}\left(\text{aq}\right){\text{+K}}_{\text{2}}{\text{SO}}_{\text{4}}\left(\text{aq}\right)\to {\text{BaSO}}_{\text{4}}\left(\text{s}\right)\text{+}{\text{2KNO}}_{\text{3}}\left(\text{aq}\right)$

In the given reaction, the barium sulphate is the insoluble substance because some sulphate ions especially with the barium, lead etc. are insoluble.

Also, it can be seen from the given equation that all the other substances are in aqueous phase thus, they are soluble in water but barium sulphate is in solid state thus, it is insoluble in water and present in the form of a precipitate.

Conclusion:

Thus, the barium sulphate ${\text{BaSO}}_{\text{4}}$ is formed the precipitate.