H3PO4 is a tribasic acid and one of its salt is NaH2PO4. What volume of 1 M NaOH solution should be added to 12 g of NaH2PO4 convert it into Na3PO4?

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100 mL

200 mL

80 mL

300 mL

answer is B.

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Detailed Solution

Mw of NaH2PO4 = 120 g (it is dibasic) (valency factor = 2)Eq of NaOH = Eq of NaH2PO4(n=1)(n=2) 1M×1×VL=12120×2VL=0.26L=200mL

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