Name the sodium compound which is used for softening hard water.

What is hard water? What compounds are in water to make it hard?

You want to test for hardness of water but hard water is not available inthe laboratory. Which of the following compounds may be dissolved inpure water to make it hard ?(i) Hydrogen Carbonate of Sodium(ii) Sulphate of Magnesium(iii) Chloride of Calcium(iv) Carbonate of Sodium

The compound sodium chloride is an electrolyte.Group of answer choicesTrueFalse

Below is the name of a compound that is made when sodium and water react.sodium hydroxideGive the formula of the negatively charged ion present in this compound.

Sodium can be cut with a knife.Which property of sodium explains why it can be cut with a knife?It is soft.It has a low density.It is reactive.