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The normality of 5% (w/v) soln. of H3PO4 in the presence of phenolphtalein indicator is-----
5g H3PO4 is present in 100 ml of soln.
First calculate the moles of H3PO4 then calculate molarity.
i.e M = n/V (ltrs.)
then Normality = Molarity x Valence factor
= M X 5
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