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Q.

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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a

200 mL

b

80 mL

c

300 mL

d

100 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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