If a 100mL of urea solution is isotonic with 10%(w/V) solution of cane sugar , then calculate the weight of urea in the urea solution
Given: The molecular mass of cane sugar is 342gmol−1 and that of urea is 60gmol−1.
A
1.75g
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B
0.54g
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C
2.58g
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D
1.01g
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Solution
The correct option is A1.75g Isotonic solution:
Two solutions having the same osmotic pressure across a semipermeable membrane is referred to as an isotonic solution. 10%(w/V) cane sugar solution means, 10g of cane sugar is there in 100mL of solution. Molar concentration of cane sugar=w1m1×V1=10342×0.1
and Molar concentration of urea=w2m2V2=w260×0.1
Here V1 and V2 are the volumes of solutions in L
For isotonic solutions,