Question

Concentration of H+ (aq) ions in a solution is 10^-11 moles/litre. Calculate its pH value. State the action of (i) methyl orange , (ii) phenolphthalein on this solution.​

Answer 1

Answer: pH=11

i)Yellow

ii)Pink

Step by Step Explanation:

pH = - log([H+])

[H+] = 10^-11 M

pH = - log(10^-11)

pH = - (-11).log(10)

pH = - (-11).1 = 11 [since , log10=1]

Because pH = 11 (7 ≤ pH ≤ 14) the solution is basic in nature..

i) Turns Yellow in Color

ii) Turns Pink in Color

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