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Distinguish between temporary hardness a...

Distinguish between temporary hardness and permanent hardness.

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Temporary hardness is

You are provided with two samples of hard water, one containing temporary hardness and the other permanent hardness. Without the help of any chemical, how will you identify the nature of the sample.

Distinguish between : a. Hard water and soft water b. Temporary hardness and permanent hardness

By which reason temporary and permanent hardness occur ?