Why molecular mass of acetic acid in benzene determined by any Colligative property is higher than its actual molecular mass?
Table of Contents
- 1 Why molecular mass of acetic acid in benzene determined by any Colligative property is higher than its actual molecular mass?
- 2 What is the molecular mass of acetic acid in benzene?
- 3 What is the molecular mass of acetic acid?
- 4 What is molecular mass of acetic acid?
- 5 When acetic acid is dissolved in benzene its molecular mass increase or decrease?
- 6 Why is the observed molecular mass of Ethanoic acid is twice the expected value?
Why molecular mass of acetic acid in benzene determined by any Colligative property is higher than its actual molecular mass?
Solutions. The molar mass of acetic acid determined from the measurement of a colligative property is greater than its formula molar mass. The molar mass of acetic acid in a solution of benzene solvent is greater than its formula molar mass because two CH3COOH molecules form a dimer (CH3COOH)2 in solution.
What is the molecular mass of acetic acid in benzene?
Hence, in benzene, acetic acid shows the molecular weight of 118 g/mol.
Why is the relative molecular mass of Ethanoic acid 120 in benzene?
The correct answer will be d) 120. Ethanoic acid (molar mass 60 g/mol) dimerises in benzene due to hydrogen bonding between its molecules and hence the molecular mass is higher than normal value.
When molecular mass of acetic acid is calculated using Colligative properties it is twice of actual value Why?
ANSWER. Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by association. In benzene solution, two molecules of acetic acid associate to form one molecule. Hence, the observed molar mass will be twice the actual molar mass.
What is the molecular mass of acetic acid?
60.052 g/mol
Acetic acid/Molar mass
What is molecular mass of acetic acid?
Which of the following is the molecular mass of acetic acid?
60.05 g/ mol
Therefore, the molar mass of acetic acid is 60.05 g/ mol.
What is the relative molecular mass of acetic acid?
120g/mol
The molecular mass of Acetic acid (Ethanoic acid) is 120g/mol when it is dissolved in Benzene.
When acetic acid is dissolved in benzene its molecular mass increase or decrease?
Acetic acid is one of them that tends to dimerize when dissolved in benzene. This association leads to its abnormal molar mass.
Why is the observed molecular mass of Ethanoic acid is twice the expected value?
Due to association of ethanoic acid or benzoic acid, the ΔTf or ΔTb value will be about half of the normal value. Therefore, the molar mass calculated on the basis of ΔT will be about twice the expected value.