Bromothymol blue is a chemical indicator that turns blue at ph values greater than 7. in which of these solutions would a blue color be observed if 2 drops of bromothymol blue were added? the concentration of each solution is 0.10 m. ka for hc2h3o2 (aq) = 1.8 ' 10-5, kb for nh3 (aq) = 1.8 ' 10-5

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Chemistry

9 November, 04:18

Bromothymol blue is a chemical indicator that turns blue at ph values greater than 7. in which of these solutions would a blue color be observed if 2 drops of bromothymol blue were added? the concentration of each solution is 0.10 m. ka for hc2h3o2 (aq) = 1.8 ' 10-5, kb for nh3 (aq) = 1.8 ' 10-5

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Miah Thornton · Answer 1

The two solutions are

CH3COOH (acetic acid) : it is a weak acid and will dissociate less (as its Ka is very low). Even then it will give an acidic solution. The concentration of proton will be less but it will be more than the concentration of hydroxide ions and pH of solution will be less than 7.

Thus bromothymol blue will not turn blue

NH3: ammonia

It is a weak base and will dissociate less to give hydroxide ion. EVen then it will be basic in nature. The concentration of hydroxide ion will be less but it will be more than the concentration of protons and pH of solution will be more than 7.

Thus bromothymol blue will turn blue