Respuesta :
Answer : Phenolphthalein is pink in an aqueous solution having a ph of 12.
Explanation :
Phenolphthalein is an acid-base indicator. It is a colorless solution which remains colorless in acidic solution and changes to pink in basic solution.
An acidic solution has a pH of less than 7 whereas a basic solution has a pH of greater than 7.
The pH transition range for phenolphthalein is between 8-10. Than means when the pH is greater than 8, the color of the solution starts to change.
Among the given options, the only option that shows a basic solution is option (4) . Therefore we can say that phenolphthalein would be pink in a solution having a pH of 12.
Phenolphthalein is pink in an aqueous solution having a pH of 12, it means given solution is basic in nature.
What are indicators?
Indicators are those substances which are genrally used in acid - base titration process to get notified about the equivalence point.
Phenolphthalein is an acid base indicator which is also used in the acid base titration to check the acidity or basicity of the reaction. It is a colorless liquid and remain color less in an acidic solution but changes its color to pink color when comes in contact with the base.
We know that according to pH range, acids shows pH value in betwen the 0 to 6.9 and bases shows pH value in between the 7.1 to 14.
So, phenolphthalein is pink in the solution of pH 12.
To know more about Phenolphthalein, visit the below link:
https://brainly.com/question/10848675
