Hello candidate,

Let's first know about Alkalinity- Alkalinity is measured by titrating a water sample with a standard acid to a designated pH and is recorded as P or M alkalinity.

The P alkalinity is titrated with phenolphthalein to pH 8.3, and the M alkalinity with methyl orange indicator to pH 4.6. So as, 2P= M, which means that, it is P type Alkalinity.

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Thank You!!