Three true or false chemistry question?

which statements about indicators is FALSE?





An indicator is an organic dye.


An indicators color depends on the [H3O]


phenolphtalein is colorless when the pH%26gt;8


Many acid-base indicators are vegetable/plant dyes





consider the titration curve describing the titration of a strong acid by addition of a strong base.which of the following statements about is FALSE?





A. the equivalence point is at pH =7.0


B. the pH is lower at the end of the titration than the begining


C. the pH increases rapidly around the equivalence point


D. at the equivalence point, the only species present are water and neutral salt


E. the pH does not increase very rapidly at the begining of the titration.








Which statement about titration curves is FALSE?





A. a titration curve for titrating a strong acid/strong base will always have an equivalence point at pH= 7


B. a titration curves show how pH changes near the equivalence point


C.the end point on a titration curve is the point where chemically equivalence amounts of acid and base have reacted


D.in titration curves for weak acid/weak base, pH changes near the equivalence point are too small for color changes to be used.


E.the equivalence point will be basic when titrating a weak acid with a strong base.Three true or false chemistry question?
For the first one,


';phenolphtalein is colorless when the pH%26gt;8'; is false.


Phenolphthalein is pink when the pH is above 8.





For the second one,


B. the pH is lower at the end of the titration than the begining is False.


You are adding base, so the solution is getting more and more basic, which means the pH is increasing.





For the third,


C.the end point on a titration curve is the point where chemically equivalence amounts of acid and base have reacted is false


What I learned is that the end point is when the indicator changes color.





Hope I've helped!