Q. 20

Determine the osm

Answer :

When K2SO4 dissociates,

The number of ions produced are = 2+1 = 3

Vant Hoff’s factor i = 3

To calculate osmotic pressure, we know,

[As, n = ]

Here, π is the osmotic pressure

n = Number of moles of solute

w = Weight of solute

M = Molecular mass of solute

R = Gas constant

t = Temperature

From the question,

w = 0.025gm

Volume V = 2L

t = 298 K

R =0.0821 L atm K–1mol–1

M = 174gm mol-1

Putting all the values,

So, osmotic pressure is

π = 5.27 × 10-3 atm.

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