Question

Solution A contains 7 gm per litre of magnesium chloride and solution B contains 7 gm per litre of sodium chloride .At room temperature the osmotic pressure is

Answer 1

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At room temperature the osmotic pressure of solution A is greater than that of solution B because MgCl2 will have more number of particles on dissociation than NaCl.

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Answer 2

Answer:

Explanation:

We have

Molarity in terms of mole per Lit.,but in question given that molarity in gm per Lit

So we divide gm per Lit by substance molecular mass.

By putting the value of in

mole per Lit=gm per Lit / molecular mass of substance

So.....we get a

Molarity of A=7 / 95 mole per Lit

And. Molarity of B=7 /58.5 mole per Lit

We have π = MRT i where M - molarity

i - von't horff factor

At room temperature for both solutions A & B are same :.R and T are same for the both

So π is directly proportion to M i

π of A = 7×3 / 95 .......... As i of A (MgCl2) = 3

π of B = 7×2 / 58.5 ...........As i of B (NaCl) = 2

By comparing A and B

We get π of A > π of B.