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The molecular mass of an organic acid wa...

The molecular mass of an organic acid was determined by the study of its barium salt. `4.290g` of salt was quantitiatively converted to free acid by the reaction with `21.64ml` of `0.477 MH_(2)SO_(4)`. The barium salt was found to have two moles of water of hydration per `Ba^(+2)` ion and the acid is mono basic. what is molecular weight of anhydrous acid.

A

`137.32`

B

`415.7`

C

`242.4`

D

`244.4`

Text Solution

Verified by Experts

The correct Answer is:
D
Meq of barium salt = Meq. of acid `=21.64 xx 0.477 xx 2 = 20.64`
Molecular weight of salt `=415.7`
Mw of anhydrous salt `=379.7`
Molecular weight of anion `=397.7 - 137.3 = 242.4`
Molecular weight of acid `= 244.4`
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