Question

What color would a phenolphthalein solution be at ph=11 ?

Answer 1

Pink

Step-by-step explanation:

The Ph scale is used to determine if a chemical compound is an acid, a base or neutral. The scale ranges from 0 to 14.

Acids turn litmus red and have a ph range between 0 and 6.9. Bases turn litmus blue and have a ph range between 8.2 and 14.

Phenolphthalein is ordinarily colorless however, in a basic solution which gives a ph of 11, it is is gives a pink coloration.

Answer 2

Colurs of Phenolphthalein at different pH's are as follow,

When pH is less than zero, means when the conditions are strongly acidic then it imparts Orange Color.

At pH ranging from zero to 8.2 (acidic or weakly acidic conditions) it is colorless.

At pH ranging from 8.2 to 12 (Basic conditions) it imparts Pink color.

At pH greater than 13 (strongly basic) it is again Colorless.

Result:
So, At pH = 11 phenolphthalein solution gives Pink Color.