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Secondary School

Chemistry

5 points

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

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byAditisharma025513.03.2019

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techtro

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Isotonic solutions have same osmotic pressure if osmotic pressure of KCl solution is to calculate the degree of dissociation of KCl solution.

Check below solution



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kobenhavn

Ambitious

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.







As 









0.25 0 0

  

Total moles after dissociation =

thus 





Thus degree of dissociation is 25%.