Question

What is the Na+ Ion concentration in the solution formed by mixing 20 ml of 0.10M Na2SO4 solution with 50 ml of 0.30M Na3PO4 solution?​

Answer 1

Answer:

Correct option is D)

The dissociation reactions are as follows:

NaCl⇋Na

+

+Cl

−

Na

2

SO

4

⇋2Na

+

+SO

4

2−

The expression for the molarity of the mixture is [Na

+

]

mix

=

V

1

+V

2

M

1

V

1

+M

2

V

2

Substituting values in the above expression, we get

[Na

+

]

mix

=

30+70

0.12×30+0.30×70

=0.246M