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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.

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Answer:

The molality of the solution is 1.10 m/kg

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

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