Which of the following pair of solutions is isotonic? A. 18 g/L of glucose of solution and 6 g/L of Urea solution B. 10 g/L of glucose solution and 10 g/L of Urea solution C. 0.01 MNaOH solution and…

Question

Which of the following pair of solutions is isotonic?
A.

18 g / L

of glucose of solution and

6 g / L

of Urea solution
B.

10 g / L

of glucose solution and

10 g / L

of Urea solution
C.

0.01 MNaOH

solution and

0.02 M

glucose solution
D.

0.01 MNaCl

solution and

0.01 M

glucose solution (Assume that

NaCl

undergoes complete dissociation)

Accepted Answer

Correct answer: B. (b) Osmotic pressure = CRT; C is in moles /L. C= nV= m MV m= mass of solute and M= mol. wt. of solute V= Volume in L. At a given T, isotonic solution; _1= _2 ;C_1 RT=C_2 RT (A.) 18 g/L of glucose = (18/180 )/L=0.1 mol/L=0.1 (M ) and 6 g ∖L of Urea = (6/60 )/L=0.1 mol/L=0.1 (M ) (B.) (B . )10 g/L of glucose= ( 10180 )/L= ( 118 )/L=0.06 (M )10 g/L of urea= ( 1060 )/L= ( 16 )/L=0.17 (M ) ∴ C_1 C_2 (C.) 0.01 (M ) NaOH solution and 0.02 (M ) glucose solution are isotonic. _ NaOH=2 0.01 RT=0.02 RT _ glucose=0.02 RT ∴ _ NaOH= _ glucose ∴C_1 C_2 (D.) 0.01 (M ) NaCl solution are 0.01 (M ) glucose solution _ NaCl=0.02 RT _ glucose=0.01 R T ∴ _ NaCl _ glucose

Solution

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