Answer to Question #251315 in Physical Chemistry for SHANIB HUSSAIN

Question

What is meant by alkalinity of water ? Explain the various condions involved in determining the nature of alkalinity. 

Answer 1

The alkalinity of water is a measure of how much acid it can neutralize. If any changes are made to the water that could raise or lower the pH value, alkalinity acts as a buffer, protecting the water and its life forms from sudden shifts in pH value.

Conditions involved in determining the nature of alkalinity include:-

phenolphthalein indicator:-The alkalinity in a water sample measured by the amount of standard acid required to lower the pH to a level of 8.3, as indicated by the change in color of phenolphthalein from pink to clear.

pH level:-Water with a high alkalinity will experience less of a change in its own acidity, for instance, when acidic water, such as acid rain or a acid spill, is introduced into the water body.

Calcium carbonate :- raises the pH and alkalinity of the water.