Phenolphthalein is the indicator that will be used to signal the endpoint in this week's titration. What color change does phenolphthalein go through at the endpoint? (Hint: the original solution in the flask is acidic.)
A. red to pink
B. clear to blue
C. red (pink) to clear
D. clear to red (pink in dilute solution)
Answer
D. clear to red(pink in dilute solution)
Explanation
Phenolphthalein is an acid base indicator , ts working pH range is 8.2 to 10.0.
In acidic solution it is colourless and in basic solution its red( pink in diluted solution )
It is used in acid - base titration involving strong bases , Strong base vs strong acid , strong base vs weak acid .
Phenolphthalein is the indicator that will be used to signal the endpoint in this week's titration....