Match the items on the right to the items on the left.

Hard water	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Soap	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Limestone	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Insoluble	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Washing soda	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Temporary hardness	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Permanent hardness	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts
Ion exchange resin	??? calcium carbonate Calcium sulphate Calcium hydrogen-sulphate swaps sodium ions for calcium ions does not dissolve sodium carbonate sodium stearate Contains calcium or magnesium salts