Question

The concentration of sucrose solution which is
isotonic with 0.02 M solution of Na, SO4 (assume
complete dissociation) at 30°C is
(1) 0.04 M
(2) 0.02 M
(3) 0.06 M
(4) 0.08 M
​

Answer 1

Explanation:

hope it helps...............

Answer 2

Given: 0.02 M solution of sodium sulfate and it is isotonic with sucrose solution.

To find: We have to find the concentration of sucrose solution.

Solution:

As the sodium sulfate solution and the sucrose solution are isotonic so, they have the same osmotic pressure.

Sodium sulfate dissociate as-

$Na_2SO_4\rightarrow 2Na^++SO_4^{2-}$

The vant hoff factor, i=2+1

i=3

The osmotic pressure of sodium sulfate is as follows-

π=0.02×3×RT

The osmotic pressure of sucrose is as follows-

π=xRT

Here x is the concentration of sucrose solution.

Now we can write-

$0.02 \times 3 = x \\ x = 0.06$

So, the concentration of sucrose solution is 0.06M.