When 0.5mol of a certain ionic substance is dissolved in 1.0kg of water, the freezing point of the resulting solution is -1.86 ∘c.(freezing point depression of water is -1.86 how many ions does the substance give when it dissolves

2 mole of ion are dissolved in this solution

Explanation:

Coligative property for Freezing point depression.

The formula is this:

ΔT = Kf. m . i

How many ions does the substance give when it dissolves. This question is asking for the i value.

0° - (-1.86°C) = 1.86 °C / m . 0.5m . i

1.86 °C  / 1.86 °C /m . 0.5 m= i

2= i

d. temperate deciduous forest