Ascientist wants to test how much of a base can be added to a solution before the ph of the solution changes to above a certain point. the starting ph of the solution is 7.0, and the scientist wants to know when the ph of the solution changes to above 8.0.which ph indicator should the scientist use? a. methyl yellow, which changes from yellow to red around a ph of 4.0 b. congo red, which changes from red to violet around a ph of 5.0 c. alizarin yellow r, which changes from yellow to red around a ph of 10.2 d. phenolphthalein, which changes from colorless to purple around a ph of 8.3

The right answer is D.Phenolphthalein, which changes from colorless to purple around pH of 8.3 (since it is the closest to pH 8).

Phenolphthalein (the symbol φφ (phi-phi) or the general notation HIn, common to other indicators, are used) is an organic compound of formula C20H14O4. It is a pH indicator (or a colored indicator), that is to say, a compound that changes color according to the pH value of the solution in which it is placed.

Phenolphthalein, which changes from colorless to purple around pH of 8.3

Explanation:

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we would need to see the picture to answer it