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Temporary Hardness and Removal

In this Ca SO...

Question

In this Ca SO₄.1/2 (H₂O ) how a molecule of water can be divide into half?

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Solution

In plaster of paris two formula units of CaSO₄ share one molecule of water.
In the formula it is written as half water molecule because in the formula we are showing only one unit of CaSO_{4.
Hence Written as 1/2 for one unit of CaSO4}

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