First slide

Theory of dilute solutions

Question

How much amount of NaCl should be added to 600 g of water $(ρ = 1.00 g / m L)$ to decrease the freezing point of water to - 0.2°C ?
______ ( The freezing point depression constant for water =2 K kg ${mol}^{- 1}$ )

Moderate

Solution

$Δ Τ_{f} = 0.2 K; m = \frac{Δ Τ_{f}}{i * Δ K_{f}} = \frac{0.2}{2 \times 2} = 0.05 m$
For Nacl,1=2
$\begin{array}{l} =0.03moles of NaCl \\ =0.03×58.5g of NaCl \\ =1.76g of NaCl \end{array}$

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