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Osmotic Pressure and Osmotic Potential

Assuming each...

Question

Assuming each salt to be 90% dissociated, which of the following will have highest osmotic pressure?
a. decinormal Al₂(SO₄)3
b. decinormal BaCl₂
c. decinormal Na₂SO₄
d. all of the above

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Solution

Osmotic pressure is a colligative property and depends on the Van't Hoff factor, i.
i has the highest value for Al₂(SO₄)₃ as it dissociates to give 5 ions and therefore the osmotic pressure would be highest for solution containing decinormal Al₂(SO₄)₃

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