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Chemistry mole calculation problem (help me)

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nid404:
Look at the equation carefully

Na has a charge of +1. The salt formed is Na3A  which means A has charge of -3.

They say citric acid is HxA

A has a charge of -3. H has a charge of +1. so x has to be 3 to balance the charge on the acid.

xim7007:
Yup. I got it. Thanx a lot Ahana.  :)

nid404:
Welcome (:

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