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why is osmoti...

Question

why is osmotic pressure of 1M NACL higher than 1M glucose solution?

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Solution

osmotic pressure is a colligative property and depends on the number of solute particles in solution.
NaCl dissociates into two ions while glucose being covalent does not.
So, number of particles in 1M NaCl will be twice as much as in 1M glucose.

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Q. Statement - I: 1 M solution of NaCl has a higher osmotic pressure than 1 M solution of glucose at the same temperature.
Statement - II: The number of particles present in 1 M NaCl solution are more than those present in 1 M glucose solution and osmotic pressure depends upon number of particles present in the solution.

Q. Assertion :Osmotic pressure of

1 M

glucose is lesser than

1 M

N a C l (a q)

but vapour pressure of

1 M

glucose is higher than

1 M

N a C l

. Reason: Osmotic pressure is colligative property but vapour pressure is not colligative property however, lowering in V.P. is colligative property.

In equimolar solution of glucose, NaCl and BaCl₂, the order of osmotic pressure is as follows:

Q. 1 molal solution of NaCl has _______ osmotic pressure than 1 molal solution of urea.

0.1 M

N a C l

has greater osmotic pressure than

0.1 M

solution of glucose at the same temperature. Reason:

N a C l

dissociates to produce more number of particles.

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