Question

concentration of the solution in % (m/m). 3. The concentration of all salts present in sea water is 3.52% (m/v). Calculate the volume of sea water we evaporation will produce 5 kg of salts. water (Ans.,​

Answer 1

Answer:

Given that:

%by mass ofNaCl=3.5% in sea water

So in 100 g of sea water, Mass of NaCl=3.5g

Molecular weight of NaCl = 58.5 g

No. of moles =

58.5

3.5

Density of sea water=1.04gcm

−3

at T=298 K

V=m/d

Volume of solution =

(1.04×1000)g/L

100g

Molarity, M=

58.5

3.5

×

100

1.04×1000

Gas constant, R = 0.0821

Temperature, T = 298 K

Vant hoff factor, i = 2

Thus osmotic pressure will be,

π=iMRT

π=2×

58.5

3.5

×

100

1.04×1000

×0.0821×298

π=30.40atm

Answer 2

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