i need help with justifing using Bromothymol blue indicator instead of Phenolphthalein indicator in a titration of HCL into Ca(OH)2
does any1 know why it is better?? help please!!!
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chemistry indictors!? watch
- Thread Starter
- 14-12-2003 15:33
- 14-12-2003 16:21
I've never used the blue one, but it can be difficult determining the end-point of a reaction with phenolphthalein, because it's such a pale pink. If the blue one gives clearer indication than that, use it!
- 16-12-2003 15:37
Bromothynol blue is used for reactions with a pH of approx 6-7.5 where as phenolphthalein is for 8-10. THe reaction you are talking approx pH of 7 so b/b is the best indicator. (I had got a table showing this but can't find it on this computer - sorry.)