Question

An aqueous solution contains the amino acid glycine (NH2CH2COOH). Assuming that the acid does not ionize in water, calculate the molality of the solution if it freezes at −2.05°C. The freezing point depression constant for water is 1.86°C/m.

Answer 1

The molality of the solution is 1.10 m/kg

Step-by-step explanation:

Colligative property: freezing point depression.

ΔT = Kf. m

ΔT = T°fussion pure solvent - T° fussion solution

Kf = depression constant for water

0°C - (-2.05°C) = 1.86 °C/m . m

2.05°C = 1.86°C/m . m

2.05°C / 1.86° m/°C = m → 1.10 m/kg