Bromophenol blue can be used as the indicator for the titration of hydrogen carbonate ion, a weak base, with HCl, a strong acid. This reaction can be represented by the following equation:
HCO3- (aq) + H+ (aq) --> H2CO3 (aq)
The equivalence point of this titration occurs at about pH 3.8. Qualitatively describe the series of color changes that occur as this titration proceeds.
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