which of the following 0.1 M aqueous solution will exert highest osmotic pressure ?
A) Al2(SO4)3
B) Na2SO4
C) MgCl2
D) KCL
Answers
Answered by
22
A) will exert highest osmotic pressure as van't Hoff factor for aluminium sulphate will be maximum.
aluminium sulphate dissociates into max no l. of ions(5) amongst all the options.
so your answer is 1)
aluminium sulphate dissociates into max no l. of ions(5) amongst all the options.
so your answer is 1)
Answered by
16
(A) Al₂(SO₄)₃
Exaplantion :- as you know,
π = iCRT
where , π is osmotic pressure , i is van't Hoff' factor, R is universal gas constant and T is temperature of solution .
Here you can see that, osmotic pressure is directly proportional to van't Hoff' factor .
For Al₂(SO₄)₃ ⇔2Al³⁺ + 3SO₄²⁻
1 - α , 2α, 3α
i = 1 - α + 2α + 3α = 1 + 4α
Similarly for Na₂SO₄ ,MgCl₂, i = 1 -α + 2α + α = 1 + 2α
and KCl , i = 1 -α + α + α = 1 + α
What you observed ? i for Al₂(SO₄)₃ is largest that's why osmotic pressure is highest for it
Exaplantion :- as you know,
π = iCRT
where , π is osmotic pressure , i is van't Hoff' factor, R is universal gas constant and T is temperature of solution .
Here you can see that, osmotic pressure is directly proportional to van't Hoff' factor .
For Al₂(SO₄)₃ ⇔2Al³⁺ + 3SO₄²⁻
1 - α , 2α, 3α
i = 1 - α + 2α + 3α = 1 + 4α
Similarly for Na₂SO₄ ,MgCl₂, i = 1 -α + 2α + α = 1 + 2α
and KCl , i = 1 -α + α + α = 1 + α
What you observed ? i for Al₂(SO₄)₃ is largest that's why osmotic pressure is highest for it
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