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A solution containing 1.9 g per …

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A solution containing 1.9 g per 100 mL of KCl ( M= 74.5 g mol-¹ ) is isotonic with a solution containing 3 g per 100 mL of urea (M= 60 g mol-¹). Calculate degree of dissociation of KCl solution. Assume that both the solutions have same temperature.

Posted by Piyush Barde 4 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 4 years, 3 months ago

Answer: 25%

Explanation: Isotonic solutions are those solutions which have the same osmotic pressure. If osmotic pressures are equal at the same temperature, concentrations must also be equal.

for non electrolytes such as urea

for electrolytes such as

= osmotic pressure

C= concentration

R= solution constant

T= temperature

i= vant hoff factor

For urea solution: 3 g of urea is dissolved in 100 ml of solution.

For solute A: 1.8 g of A is dissolved in 100 ml of solution.

0.25 0 0

Total moles after dissociation =

thus

Thus degree of dissociation is 25%.

2Thank You

ANSWER

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