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0.70 g of a sample of Na(2)CO(3).xH(2)O ...

0.70 g of a sample of `Na_(2)CO_(3).xH_(2)O` were dissolved in water and the volume was made to 100 ml. 20 ml of this solution required 19.8 ml of (N/10) HCl for complete neutralisation. The value of x is

A

2

B

1

C

4

D

10

Text Solution

Verified by Experts

The correct Answer is:
A
Eq. `Na_(2)CO_(3)` = eq. HCl
`20xxN=19.8xx(1)/(10)impliesN=(19.8)/(200)`
`(w)/(VxxM.wt)xx2=(19.8)/(200)impliesM.wt=141.4impliesx=2`
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