Q265
Phenolpthalein alkalinity is also known as
A.
Pure alkalinity
B.
Carbonate alkalinity
AnswerC.
Natural alkalinity
D.
Impure alkalinity
Answer: Option B
Solution
Answer: Option B
Solution:
Phenolpthalein alkalinity is also known as Carbonate alkalinity.The alkalinity in a water sample is measured by the amount of standard acid required to lower the pH to a level of 8.3, as indicated by the change in colour of phenolphthalein from pink to clear.
Phenolphthalein alkalinity is determined by titration to a pH of 8.3 and indicates the total hydroxide and half the carbonate present.