A sample of NaHCO(3) + Na(2)CO(3) requir...

A sample of `NaHCO_(3) + Na_(2)CO_(3)` required 20 ml of HCl using phenolphthalein as indicator and 35ml more required if methyl orange is used as indicator . Then molar ratio of `NaHCO_(3)` to `Na_(2)CO_(3)` is

`1/2`

`2/3`

`3/4`

`1/3`

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A mixture NaOH+Na_(2)CO_(3) required 25mL of 0.1 M HCl using phenolpththalein as the indicator. However, the same amount of the mixture required 30mL of 0.1M HCl when methyl orange was used as the indicator. The molar ration of NaOH and Na_(2)CO_(3) in the mixture was:

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A solution containing Na_(2)CO_(3) and NaOH requires 300 ml of 0.1 N HCl using phenolphthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is (NaOH=40, Na_(2)CO_(3)=106)

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