Question

what is alkalinity?How does it vary with each indicator used?​

Answer 1

Answer:

Alkalinity  is the capacity of water to resist acidification. It should not be confused with basicity which is an absolute measurement on the pH scale.

Explanation:

Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra. so, having different spectra the alkalinity also varies.

Answer 2

Alkalinity :

• It refers to the neutralizing capacity of a base towards an acid.

• In other words, it refers to the buffering capacity i.e. ability to resist the change in the medium when an acid is added.

• So, higher the alkalinity , hair will be the power of the base to neutralize an acid and maintain a stable pH.

• From a chemical point of view, alkalinity measures the amount of basic ions like carbonates and bicarbonates present in a solution.

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• Alkalinity varies with different indicators during titration because the colour change occurs at various pH.

• For example , phenolpthalein indicator changes colour at pH 8.3 , when all the the carbonate and bicarbonate ions gets protonated.

• However methyl orange gets colour change at a different pH.

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