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

Discussion Forum : Mole Concept

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 $N a H_{2} P O_{4}$ = $\frac{12}{120}$

$E_{N a O H}$ = $E_{N a H_{2} P O_{4}}$

V $\times$ 1M = $\frac{12}{120}$ $\times$ 1000 $\times$ 2

V =200ml

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