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An aqueous solution containing 0.0020 m of an ionic compound, Co(NH3)5(NO2)Cl, has a freezing point of -0.00732 °C. If Kf = 1.86 °C m⁻¹, how many moles of ions are produced when 1 mole of this compound dissolves in water?

1. 3
2. 4
3. 1
4. 2

Correct answer: 2

Solution

i = 0.00732/(1.86*0.0020) = 1.97 ~ 2, so the compound gives 2 ions ([Co(NH3)5(NO2)]+ and Cl-). The stored answer (1 ion) is wrong.

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