2007-04-30 05:09:10 · 2 answers · asked by amandac 3 in Science & Mathematics ➔ Chemistry
You just want two colours for a titration, not a whole range of them. An indicator is supposed to change colour when one drop of surplus acid (or alkali) has been added. Universal Indicator can never do that.
2007-04-30 05:34:25 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
I do basic titrations for my work. Universal indicator can be expensive and confusing. It makes more sense to use an indicator that reacts at a certain pH needed for a accurate result to the titration. This way instead of figuring out what color the indicator is, you're looking to see if there is any color change at all. A common indicator for acid-base titrations is Phenolphthalein because the reactive range starts at a pH of 8.6 which is slightly above neutral and the typical endpoint for the acid-base titrations.
2007-04-30 12:24:43 · answer #2 · answered by Moobie 2 · 0⤊ 1⤋