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The sodium salt of an acid dye contains ...

The sodium salt of an acid dye contains 7% of sodium. What is the minimum molar mass of the dye?

A

336.5

B

286.5

C

300.6

D

306.5

Text Solution

Verified by Experts

The correct Answer is:
D
7 gm of sodium in 100 gm of acid dye
`:.` 23 gm of sodium will be present in `= (23 xx 100)/(7) = 328.5` (molecular of dye salt)
In acid dye, one Na atom replaces a H atom. `:.` Molecular weight of acid dye = 328.5 – 23 + 1 = 306.5
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