Indicator colour question.
I have come across this question asking what colour change occurs at the end point of the titration of sodium carbonate with hydrochloric acid if a methyl orange indicator is used.
The data sheet shows methyl orange as appearing red in acidic solutions and yellow in alkaline solutions and having a pH range of 3.2- 4.4.
The correct answer is given as C.
I would assume that as it is a strong acid- strong base reaction, the equivalence point would be at pH=7 and am unsure why this indicator is used, as the titration pH should not enter its range.
Any help would be appreciated.
The data sheet shows methyl orange as appearing red in acidic solutions and yellow in alkaline solutions and having a pH range of 3.2- 4.4.
The correct answer is given as C.
I would assume that as it is a strong acid- strong base reaction, the equivalence point would be at pH=7 and am unsure why this indicator is used, as the titration pH should not enter its range.
Any help would be appreciated.
(edited 11 months ago)
Original post by Tagsmags
I have come across this question asking what colour change occurs at the end point of the titration of sodium carbonate with hydrochloric acid if a methyl orange indicator is used.
The data sheet shows methyl orange as appearing red in acidic solutions and yellow in alkaline solutions and having a pH range of 3.2- 4.4.
The correct answer is given as C.
I would assume that as it is a strong acid- strong base reaction, the equivalence point would be at pH=7 and am unsure why this indicator is used, as the titration pH should not enter its range.
Any help would be appreciated.
The data sheet shows methyl orange as appearing red in acidic solutions and yellow in alkaline solutions and having a pH range of 3.2- 4.4.
The correct answer is given as C.
I would assume that as it is a strong acid- strong base reaction, the equivalence point would be at pH=7 and am unsure why this indicator is used, as the titration pH should not enter its range.
Any help would be appreciated.
It’s a strong acid-weak base titration, as Na2CO3 is a weak base. As such, the equivalence point will be below 7, so methyl orange may be a suitable indicator.
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