To be able to see a measurable effect, your boiling point elevation must be at least 1.00°C. Knowing that the Kb­ of water is 0.512\frac{^\circ\text{C}\cdot\text {kg}}{\text{mol}}0.512 ∘ C ⋅ kg mol, determine what mass of calcium chloride (in g) is needed to see at least a 1.00^\circ\text{C}1.00 ∘ C boiling point increase in 26.63 mL of water.

Answer : The mass of calcium chloride (in g) needed is, 1.92 grams.

Explanation : Given,

Boiling point of elevation constant for water =

Mass of water (solvent) =

Molar mass of = 110.98 g/mole

Formula used :  

where,

= change in boiling point  =

i = Van't Hoff factor = 3 (for electrolyte)

= boiling point constant for water

m = molality

Now put all the given values in this formula, we get

Therefore, the mass of calcium chloride (in g) needed is, 1.92 grams.

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