Question

0.16g of dibasic acid require 25ml decimolar NaoH sol for complete neuralisation .the molecular mass of acid is

Answer 1

We begin by defining some core terms.

Diabasic — This means for every mole of the acid we have two moles of the base.

Decimolar — Molarity/10 = 0.1 M

Moles of NaOH in 25 ml is :

25/1000 × 0.1 = 0.0025 moles

Moles of the acid is :

0.0025/2 = 0.00125 moles

Mass = moles × molar mass

Molar mass = mass / moles

Molar mass = 0.16/0.00125 = 128 g/mol

Molecular mass : 128g