In the study of titration of NaOH and `Na_(2)CO_(3)`. NaOH and `NaHCO_(3)`,
Channel: Doubtnut
Date: 2020-07-12

In the study of titration of NaOH and `Na_(2)CO_(3)`. NaOH and `NaHCO_(3)`, `Na_(2)CO_(3)` and `NaHCO_(3)`, phenophthalein and methyl orange are used as indicators.  (a). When phenolphthalein is used as an indicator for the above mixture:  (i). It indicates complete neutralisation of NaOH or KOH  (ii). It indicates half neutralisation of `Na_(2)CO_(3)` because `NaHCO_(3)` is formed at the end point.  (b). When methyl orange is used as an indicator for the above mixture  (i). It indicates complete neutralisation of `NaOH` or KOH  (ii). It indicates half neutralisation of `Na_(2)CO_(3)` because `NaCl` is formed at the end point.  Q. A 10 g moxture of `NaHCO_(3)` and `KOH` is dissolved in water to make 1000 mL solution. 100 " mL of " this solution required 50 " mL of " 0.2 M HCl for complete neutralisation in the presence of phenolphthalein as indicator What is the percentage of `NaHCO_(3)` in the mixture?