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H3PO4 is a tribasic acid and one of its salts is NaH2PO4.What volume of 1 M NaOH should be added to 12 g of NaH2PO4(MOl.Wt. 120) to exactly convert into Na3PO4

H3PO4 is a tribasic acid and one of its salts is NaH2PO4.What volume of 1 M NaOH should be added to 12 g of NaH2PO4(MOl.Wt. 120) to exactly convert into Na3PO4

Grade:12th pass

1 Answers

Aman Bansal
592 Points
8 years ago

Dea Vempally,

Balanced equation:
NaH2PO4 + 2NaOH → Na3PO4 + 2H2O
1mol NaH2PO4 reacts with 2mol NaOH
Molar mass NaH2PO4 = 120.0 g/mol
6g NaH2PO4 = 6/120 = 0.05mol NaH2PO4
This will require 0.05*2 = 0.10 mol NaOH
3mol NaOH = 1000mL 
0.10mol = 0.10/3*1000 = 33.3mL NaOH required.

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