Problem 91

Step 1.

It is assumed that adding sodium chloride does not result in precipitation. Because silver ions can form insoluble precipitates with chloride ions, it shows the absence of silver ions.

Therefore, ion is absent in the solution.

When sodium chloride is added to the solution, a white precipitate is created, according to the instructions. When sodium sulphate is added to a solution, calcium ions form insoluble precipitates.

The ionic reaction of with ions is,

                     

To get the net ionic equation, remove the species that occur on both sides of the ionic equation.

                       

As a result, it determines that calcium ions are present in the solution.