InterviewSolution
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InterviewSolution
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Methy`1` red has a `K_(a) = 10^(-5)`. The acid form `"Hin"` is red and its conjugate base, `Ind^(Θ)` is yellow. Complete the following table: `{:("pH",3,5,7),(["Ind"^(Theta)]//["HIn"],-,-,-),("Colour",-,-,-):}` |
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Answer» `10^(-2), 1, 10^(2)`, Red, Orange, Yellow. i. `pH = 3, [H^(o+)] = 10^(-3)M` `[("Ind"^(Θ))/("HIn")] = (K_(a))/([H^(o+)]) = (10^(-5))/(10^(-3)) = 10^(-2)` (Colour of acid form predominates, i.e., red) ii. `pH = 5, [H^(o+)] = 10^(-5)M` `:. [("Ind"^(Θ))/("HIn")] = (10^(-5))/(10^(-5)) = 1` (Colour is mixture of red and yellow, i.e. orange) iii. `pH = 7, [H^(o+)] = 10^(-7)M` `[("Ind"^(Θ))/("HIn")] = (10^(-5))/(10^(-7)) = 10^(2)` (Colour of basic form predominates, i.e., yellow colour) |
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