Calgon is a trade name of sodium polymetaphosphate which is used for softening of water. It is r...

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Calgon is a trade name of sodium polymetaphosphate which is used for softening of water. It is represented as \( \mathrm{Na}_{x}\left[\mathrm{Na}_{y}\left(\mathrm{PO}_{3}\right)_{6}\right] \). The value of \( x+y \) is ......
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