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colorimetry

when is colorimetry used to investigate rate of reaction?

i can clearly see that MEASURE THE VOLUME OF A GAS EVOLVED & MEASURE THE CHANGE IN MASS OF A REACTION MIXTURE are used depending on the density of evolved gas

and MEASURE THE ELECTRICAL CONDUCTIVITY is used when the non- charged reactants become charged products or vice versa

but the 2 remaining method COLORIMETRY & ANALYSIS BY TITRATION is quite confused
even the book hasn't stated anything clear. it just says the benefits of colorimetry without saying when do we need to use this method
does anyone who can tell me an explicit answer

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