H3PO4 is a tribasic acid and one of its salt is NaH2PO4. What volume of 1M

Question

H_{3} P O_{4}

is a tribasic acid and one of its salt is

N a H_{2} P O_{4}

. What volume of 1M NaOH solution should be added to 12 g of

N a H_{2} P O_{4}

to convert it into

N a_{3} P O_{4}

Options:

A . 100 ml

B . 200 ml

C . 80 ml

D . 300 ml

Answer: Option B
:
B

N a H_{2} P O_{4}

basicity = 2
No of moles of

N a H_{2} P O_{4}

\frac{12}{120}

E_{N a O H}

E_{N a H_{2} P O_{4}}

\times

1M =

\frac{12}{120}

\times

1000

\times

2
V =200ml

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