Question

Which compartment has the higher osmotic pressure? Which compartment has the higher osmotic pressure? 1%% (m/vm/v) starch solution 10%% (m/vm/v) starch solution

Answer 1

Answer : The compartment that has the higher osmotic pressure is, 10 % (m/v) starch solution.

Explanation :

Formula used for osmotic pressure :

`\pi=(nRT)/(V)\\\\\pi=(wRT)/(MV)`

where,

= osmotic pressure

V = volume of solution

R = solution constant = 0.0821 L.atm/mole.K

T= temperature of solution =
`25^oC=273+25=298K`

M = molar mass of solute

w = mass of solute

Now we have to determine the osmotic pressure for the following solution.

For 1 % (m/v) starch solution :

1 % (m/v) starch solution means that 1 grams of starch present in 100 mL or 0.1 L of solution.

Molar mass of starch = 692.7 g/mol

`\pi=((1g)* (0.0821Latm/moleK)* (298K))/((692.7g/mol)* (0.1L))`

`\pi=0.353atm`

For 10 % (m/v) starch solution :

10 % (m/v) starch solution means that 10 grams of starch present in 100 mL or 0.1 L of solution.

Molar mass of starch = 692.7 g/mol

`\pi=((10g)* (0.0821Latm/moleK)* (298K))/((692.7g/mol)* (0.1L))`

`\pi=3.53atm`

From this we conclude that, 10 % (m/v) starch solution has the higher osmotic pressure as compared to 1 % (m/v) starch solution.

Hence, the compartment that has the higher osmotic pressure is, 10 % (m/v) starch solution.