Advertisements
Advertisements
Question
Derive the relation between the elevation of boiling point and molar mass of solute.
Advertisements
Solution
The elevation in the boiling point is given by the expression `Δ"T"_"b" = "K"_"b" ."m"` .....(1)
The molality is given by the expression m = `"W"_2/("M"_2 . "W"_1)` ...(2)
Substitute equation (2) in equation (1)
`Δ"T"_"b" = "K"_"b" . "W"_2/("M"_2 . "W"_1`
APPEARS IN
RELATED QUESTIONS
8 g of glucose, C6H12O6 (Molar Mass = 180 g mol−1) is dissolved in 1 kg of water in a sauce pan. At what temperature will this solution boil?
(Kb for water = 0.52 K kg mol−1, boiling point of pure water = 373.15 K)
Out of 1 M glucose and 2 M glucose, which one has a higher boiling point and why?
Define the following term:
Molal elevation constant (Kb)
Account for the following :
H2S has lower boiling point than H2O.
Account for the following :
H2S has lower boiling point than H2O.
Arrange the following in increasing order of boiling points:
(CH3)3 N, C2 H5 OH, C2 H5 NH2
0.450 g of urea (mol. wt. 60) in 22.5 g of water show 0.170°C of elevation in boiling point. The molal elevation constant of water is:
Exactly 1 g of urea dissolved in 75 g of water gives a solution that boils at 100.114°C at 760 torrs. The molecular weight of urea is 60.1. The boiling point elevation constant for water is:
The molal elevation constant depends upon ____________.
Which of the following aqueous solutions should have the highest boiling point?
Which of the following has the lowest boiling point?
The unit of ebulioscopic constant is ______.
Explain why on addition of 1 mol of NaCl to 1 litre of water, the boiling point of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.
Why is it not possible to obtain pure ethanol by fractional distillation? What general name is given to binary mixtures which show deviation from Raoult’s law and whose components cannot be separated by fractional distillation. How many types of such mixtures are there?
Calculate the molal elevation constant for water given that 0.2 molal solution of non-volatile and non-electrolyte solute increases the boiling point of water by 0.104 K.
The boiling point to a solution containing 50 gm of a non-volatile solute in 1 kg of solvent is 0.5° higher than that of pure solvent. Determine the molecular mass of the solute (give molecular mass of solvent) = 78 g mol–1 and kb for solvent = 2.53 km–1)
Boiling point of a 2% aqueous solution of a non-volatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is ______.
Which of the following aqueous solution will have the highest boiling point?
Which of the following aqueous solutions will exhibit the highest boiling point?
