How much amount of NaCl should be added to 600 g of wat... | (Chemistry) | DivineJEE

Exam

Chemistry

How much amount of NaCl should be added to 600 g of water (

\rho

= 1.00 g/mL) to decrease the freezing point of water to – 0.2 °C ? ______.
(The freezing point depression constant for water = 2K kg mol^–1)

$\Delta$ T_f = 0.2^o C

$\therefore$ $\Delta$ T_f = ik_f.m

i = 2 for NaCl

$\therefore$ 0.2 = 2 $\times$ 2 $\times$ ${{{W_{NaCl}} \times 1000} \over {58.5 \times 600}}$

$\Rightarrow$ W_NaCl = ${{58.5 \times 600 \times 0.2} \over {4 \times 1000}}$ = 1.76 g

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