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The amount of sodium hydrogen carbonate,...

The amount of sodium hydrogen carbonate, `NaHCO_(3)`, in an antacid tablet is to be determined by 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)):}`

A

methyl orange, `pK_(In)=3.7`

B

bromothymol blue, `pK_(In)=7.0`

C

phenolphthalein,`pK_(In)=9.3`

D

alizarin yellow `pK_(In)=12.5`

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The correct Answer is:
a
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