Question

which of the following will show maximum osmotic pressure for its 1 m solution
1) AgNO3 2) MgCl2. 3) Na2SO4 4)(NH4)3 PO 4​

Answer 1

Osmotic pressure is proportional to Vant Hoff factor , i at constant concentration. Among the given , (NH4)3PO4 has the highest value of i ( = 4).

So at 1M , (NH4)3PO4 will have the highest value of osmotic pressure .

Answer 2

The maximum osmotic pressure is of $(NH_4)_3PO_4$  solution

Explanation:

The expression of osmotic pressure is given as:

$\pi=i\times MRT$

where,

$\pi$ = osmotic pressure

i = Van't Hoff factor  

M = molarity of the solution

R = gas constant

T = temperature

For the given options:

Option 1:  1 M $AgNO_3$

Value of i = 2

So, molar concentration will be = $1\times 2=2M$

Option 2:  1 M $MgCl_2$

Value of i = 3

So, molar concentration will be = $1\times 3=3M$

Option 3:  1 M $Na_2SO_4$

Value of i = 3

So, molar concentration will be = $1\times 3=3M$

Option 4:  1 M $(NH_4)_3PO_4$

Value of i = 4

So, molar concentration will be = $1\times 4=4M$

As, the molar concentration of $(NH_4)_3PO_4$ is the highest, so its osmotic pressure will be the highest.

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