The mass of salt is 196.5 g NaCl.
The collinear characteristics of solutions that the freezing point of a solution formed by the addition of a solute is lower than the freezing point of the pure solvent.
Remember the electrolytes freezing point formula.
T f = i K f m, where m is the molality of the solution, K f is the solvent's molal freezing point constant, and I is the solute's Vaunt Hoff factor relating to the number of ions created in solution.
solute mass = (T f) (MW) (mass of solvent in kg)
(1180 mL) (1.00 g/mL) (1kg1000 g)
=1.18kg is the mass of water in kilograms (i K f).
When we calculate the mass of NaCl, we obtain:
NaCl mass = (T f) (MW)
i K f mass of NaCl =−(−10.6 C) (58.4 g/mol) (1.18 kg) (2(1.86 C/m)
=196.5 g NaCl
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