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Q.

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)

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Detailed Solution

${ΔΤ}_{f} = 0 . 2^{\circ} C {ΔΤ}_{f} = {ik}_{f} m (i = 2 for NaCl) {ΔΤ}_{f} = {ik}_{f} \times \frac{mass}{molar mass} \times \frac{1000}{mass of solvent (in g)} mass = \frac{{ΔΤ}_{f} \times molar mass \times mass of solvent (in g)}{k_{f} \times i \times 1000} mass = \frac{0.2 \times 58.5 g / mol \times 600 g}{2 \times 2 \times 1000} = 1.76 g$

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