Which of the following solutions are isotonic with respect to one another?
(1) 0.15 M urea
(2) 0.05 M CaCl2
(3) 0.1 M MgSO4
(4) 0.15 M glucose
Select the correct answer using the codes given below:
Answer & explanation
Correct answer: option 2
We know,
\(\pi = iCRT\)
\(\pi (\text{0.15 M urea} = 1 × 0.15RT = 0.15RT)\) -------(1)
\(\pi (\text{0.05 M }CaCl_2\text{ = }1 × 0.05RT = 0.15RT)\) -------(2)
\(\pi (\text{0.1 M } MgSO_4\text{ = }2 × 0.1RT = 0.2RT)\) -------(3)
\(\pi (\text{0.15 M glucose} = 1 × 0.15RT = 0.15RT)\) -------(4)
From equations (1), (2), (3), and (4), we can clearly see that equations (1), (2) and (4) are equal. Hence they are isotonic.