Question

20 ml of the solution containg `Na_(2)CO_(3)` and `NaHCO_(3)` is titrated with `0.1MHCI` using Phenolphthalein indicator the end point was `10ml. 20ml` of the same solution is titrated with `0.1M HCI`, the end point was 25ml with Methylorange indicaor from the begining.
`NaHCO_(3)+HCl rarr NaCl +H_(2)O +CO_(2)`
`Na_(2)CO_(3)+2HCl rarr 2NaCl +CO_(2) +H_(2)O`
What amount of `NaOH` is required to convert `NaHCO_(3)` to `Na_(2)CO_(3)` in 1 litre of solution
A. `2g`
B. `20g`
C. `1g`
D. `0.5g`

Answer 1

Correct Answer - C
`NaHCO_(3)+NaOH rarr Na_(2)CO_(3) +H_(2)O`
84g of `NaHCO_(3)` requires 40g of `NaOH`
`2.1g` of `NaHCO_(3)` requires?
`= (40)/(84) xx 2.1 = 1g`