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Updated: June 8, 2025
In titrating solutions of alkali carbonates in the presence of phenolphthalein, the color change takes place when the carbonate has been converted to bicarbonate. In the presence of methyl orange, the color change takes place only when the carbonate has been completely neutralized. From the following data, calculate the percentages of Na CO and NaOH in an impure mixture.
Solutions of the latter strength yield more accurate results when small percentages of acid or alkali are to be determined. These substances employed as indicators are usually organic compounds of complex structure and are closely allied to the dyestuffs in character. The indicators in most common use for acid and alkali titrations are methyl orange, litmus, and phenolphthalein.
!Answers!: 6.67% NaOH; 84.28% Na CO . A sample of sodium carbonate containing sodium hydroxide weighs 1.179 grams. It is titrated with 0.30 N hydrochloric acid, using phenolphthalein in cold solution as an indicator and becomes colorless after the addition of 48.16 cc. Methyl orange is added and 24.08 cc. are needed for complete neutralization. What is the percentage of NaOH and Na CO ?
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