1.

The amount of sodium hydrogen carbonate, NaHCO_(3), in an antacid tablet is to be determinedby dissolving the tablet in water and titrating the resulting solution with hydrochloric acid. Which indicator is the most appropriate for this titration ? {:("Acid", ""K_(a)),(H_(2)CO_(3),2.5xx10^(-4)),(HCO^(-3),2.5xx10^(-8)):}

Answer»

METHYL ORANGE, `pK_(In)=3.7`
bromothymol blue, `pK_(In)=7.0`
phenolphthalein,`pK_(In)=9.3`
ALIZARIN yellow `pK_(In)=12.5`

Answer :a


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