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A 2.0 g sample containing Na2CO3 and NaH...

A 2.0 g sample containing `Na_2CO_3` and `NaHCO_3` loses 0.248 g when heated at 300° C, the temperature at which NaHC03 decomposes to `Na_2CO_3, CO_2` and `H_2O`. What is the percentage of `Na_2CO_3` in the mixture ?

Text Solution

Verified by Experts

The correct Answer is:
D
`Na_(2)CO_(3) overset(Delta)` No change
Let `x` of `Na_(2)CO_(3)` and `(2 -x) g` of `NaHCO_(3)`is due to `CO_(2)` and `H_(2) O`
`:. 2 xx 84 g NaHCO_(3) = 62 g` of weight lost
`(2 - x) g NaHCO_(3) = (62 (2 - x))/(2 xx 84) = 0.248`
`:. x = 1.328 g` (weight of `Na_(2) CO_(3)`)
`% Na_(2) CO_(3) = (1.328 xx 100)/(2) = 66.4%`
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