Which of the following pairs of solutions will be isotonic at the same temperature? - Noon Academy

Which of the following pairs of solutions will be isotonic at the same temperature?

Chemistry | Chemistry | MHTCET

Which of the following pairs of solutions will be isotonic at the same temperature?

1M NaCl and 1M MgCl₂
1.5M KCl and 2.5M Urea
1.5M AlCl₃and 2M Na₂SO₄
1M NaCl and 2M MgCl₂

Solution: 1.5M AlCl₃and 2M Na₂SO₄

The osmotic pressure and molar concentration in isotonic solutions should be the same or equal.

For AlCl₃, I = 4 as AlCl₃ dissociates into Al⁺ and 3Cl^– ions

Therefore, the osmotic pressure of 1.5M AlCl₃

= iMRT = 4 × 1.5 RT = 6RT

For Na₂SO_4,i = 3 as Na₂SO₄ dissociates into 2Na⁺ and SO₄^2- ions

Therefore, the osmotic pressure of 2M Na₂SO₄

= iMRT = 3 × 2RT = 6RT

They are isotonic because their osmotic pressures are equivalent.

i

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