February 20, 2017

Homework Help: chemistry

Posted by Amy on Sunday, May 11, 2008 at 7:53pm.

For which trial(s) is phenophthalein a good indicator? For which trial(s) was it a poor indicator? For those trials in which it was a poor indicator, suggeest a better indicator and indicate its pH range on the titration curve.

So for phenophthalein the equivalence point has to be from 8.3 to 10 right?

Trial 1: 7.29 pH so bromothymol blue indicator

trial 2: 8.14 so phenol red indicator

Trial 3: 9.21 falls between 8.3 and so that's good

trial 4: 7.01 so bromothymol blue

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