2006-10-31 03:56:42 · 9 answers · asked by nothingspecial 1 in Science & Mathematics ➔ Chemistry
It is green when it hasn't been used. It changes colour to show a different level of pH. The pH scale goes from 1 (red) - 3 (orange) - 7 (green) - 10 (blue) - 13 (purple). The closer it gets to purple the more alkali it contains. The closer it gets to red, the more acid it contains.
2006-10-31 04:08:50 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Universal indicator is a mixture of acid-base indicators designed to undergo a number of colour changes over a wide range of pH.
Jack H's answer is correct and so is Lu's. I presume they are referring to the commonest available type of universal indicator, such as BDH universal indicator. The concentrated indicator solution is very dark green, but when it's diluted, it has various colours, from red to orange, to yellow, to green, to blue, to purple, depending on the pH of the solution being tested.
There is also universal indicator paper, made from strips of filter paper impregnated with universal indicator. The one I'm familiar with is deep orange.
I believe other universal indicators exist, but I don't know what colour changes they go through.
Allan Deeds.
2006-10-31 04:21:50 · answer #2 · answered by deedsallan 3 · 1⤊ 0⤋
It starts off a dark green but changes according to what substance it is mixrd with hence the nam,e 'universal indicator'
2006-10-31 04:48:57 · answer #3 · answered by stardom 2 · 0⤊ 0⤋
Universal indicator paper is a yellow colour changing to red for acid, dark mauve for alkalis, and shades of green and yellow in between. Phenolphthalein indicator is clear to milky white.
The old litmus papers were green changing to red for acids, and red changing to green for alkalis.
2006-10-31 04:16:18 · answer #4 · answered by Phish 5 · 0⤊ 0⤋
Green/Blue i think......until u mix it with other the other liquids then it changes to represent a different level of ph. Google it for a colour chart?
2006-10-31 03:59:43 · answer #5 · answered by Anonymous · 0⤊ 0⤋
it's like a very dark greenish colour
2006-10-31 03:59:20 · answer #6 · answered by don't stop the music ♪ 6 · 0⤊ 0⤋
The one i used when i was in school was white
2006-10-31 03:59:54 · answer #7 · answered by Naomi 3 · 0⤊ 0⤋
difficult problem. seek on to yahoo or google. that will could help!
2016-03-17 06:02:57 · answer #8 · answered by Anonymous · 0⤊ 0⤋
under what conditions?
2006-10-31 04:45:41 · answer #9 · answered by shiara_blade 6 · 0⤊ 0⤋