Ionic EquilibriumHard

Question

A certain sample of rainwater gives a yellow colour with methyl red [pH range 4.2 (red) – 6.2 (yellow)] and a yellow colour with phenol red [pH range 6.4 (yellow) – 8.0 (red)]. What is the approximate pH of the water? Is the rainwater acidic, neutral or basic?

Options

A.6.3, acidic
B.6.1, acidic
C.6.5, acidic
D.6.3, basic

Solution

Yellow colour with methyl red means PH > 6.2 Yellow colour with phenol red means PH < 6.4

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