An unknown solution changed the color of a phenolphthalein indicator from coloriess to pink. What would you comment about the pH of the unknown solution?

1 Answer
anor277
May 11, 2017

That you added a basic solution, i.e. .............

Explanation:

.....a solution whose #pH>7#.

whatisthis.net

I found that phenolpthalein was one of the very best indicators to use for standard acid-base titrations, in that the acidic form is colourless, #"farblos"#, and the basic form is a lovely pink. The end-point is thus relatively simple to observe and detect. Of course, you titrate to the point of colour change, not to the colour change itself.

Related questions
See all questions in pH
Impact of this question
8207 views around the world
You can reuse this answer
Creative Commons License