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What volume of water is required to prepare 0.1 M H3PO4 from 100 ml of 0.5 M solution?
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What volume of water is required to prepare 0.1 M H3PO4 from 100 ml of 0.5 M solution?

User Dbank
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convert 100ml to dm³. next take converted volume times 0.5 (concentration) to find mols. next, write eqn and compare the mol ratio.

take mol divide by 0.1 to find volume
User Simran Kaur
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