Question

)Verify the following realities using suitable chemical equations.
i) When few drops of lead (II) nitrate are added in sodium sulphate, milky precipitates are
observed. Use an ionic equation
ii) When a small piece of potassium is dropped in water containing phenolphthalein indicator,
the whole liquid turns pink.
iii) Temporary hardness of water can be removed by boiling.

Answer 1

As you can se boiling the water causes the precipitation of solid calcium carbonate or solid magnesium carbonate. This removes the calcium ions or magnesium ions from the water, and so removes the hardness. Therefore, hardness due to hydrogencarbonates is said to be temporary.