Question

Based on the results of testing colorless solutions with indicators, which solution is most acidic?

(1) a solution in which bromthymol blue is blue
(2) a solution in which bromcresol green is blue
(3) a solution in which phenolphthalein is pink
(4) a solution in which methyl orange is red

Answer 1

Bromothymol blue is blue in a basic solution (yellow in acid).Bromocresol green is blue in a basic solution (yellow in acid).
Phenolphthalein is pink in a basic solution (colorless in acid).Methyl orange is red in an acidic solution. Therefore, the most acidic solution is #4.

Answer 2

On litmus paper (the slip of paper that changes color to measure acidity), the redder the color is, the more acidic it is.
Therefore, the solution that is most acidic is methyl orange because it was a darker red then any of the others.

Answer: Methyl Orange (#4)

Hope this helped!! :D