First slide

Theory of dilute solutions

Question

Determine the amount (in mg) of CaCl₂ (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27°C. (Take RT = 25)

Moderate

Solution

$0.75 = 2.47 \times \frac{w \times 10^{- 3}}{111} \times \frac{1}{2.5} \times 25 \Rightarrow w = 3370 m g$

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