2006-11-04 17:08:10 · 5 answers · asked by Amit Mangal 1 in Science & Mathematics ➔ Chemistry
Thymolphthalein might be what you're looking for.
2006-11-04 17:18:14 · answer #1 · answered by Brian L 7 · 0⤊ 0⤋
Thymolphthalein is the only acid-base indicator that I can think of that comes close (pH range of 9.3 to 10.5). It turns blue above pH 10.5 and is colorless below 9.3. The only problem is that it's the reverse of what you have written - it turns blue ABOVE pH 10 and is colorless at pH 9 and BELOW. Phenolphthalein is also close (pH range 8.2 to 10.0), but turns pink, not blue. This page might be useful to you: http://en.wikipedia.org/wiki/PH_indicator
2006-11-05 01:31:06 · answer #2 · answered by njchemist_sp 2 · 0⤊ 0⤋
I don't think there is any( maybe it's my limited knowledge but I've been studying chemistry for three years now) however there is one pH indicator that dose exactly the opposite(colorless under 9.4 and blue above 10.6) and it's called Thymolphthalein. I think you mean this one.
2006-11-05 01:28:43 · answer #3 · answered by CH4 3 · 0⤊ 0⤋
Thymol blue almost fits the description. It is, however, the closest I have heard of, so it is probably the one you want. It is kind of a colorless/yellow below pH = 9.
2006-11-05 01:26:33 · answer #4 · answered by Biznachos 4 · 0⤊ 0⤋
Dont really get the question. Look at what you asked and make it make sense.
2006-11-05 01:10:06 · answer #5 · answered by Anonymous · 0⤊ 0⤋