What color is the indicator alizarin yellow at pH 11.9?
150847
it changes from red to blue in the range of 11-12.5.  at pH 11.9 should be near violet.
804153
At high pH values (>10), the Hydroxide ion in solution takes protons from the phenolphthalein indicator, forming an ion and water.  The -2 ionic form of phenolphthalein then rearranges the electronic structure to form the characteristic pink color.\n\nSee the wikipedia article for more.
188127
They are wrong...It is the carotenoids. I am 100% positive! See wikipedia.org below is an excerpt from wikipedia answering the question. It is also in my AP biology book:\nTheir color, ranging from pale yellow through bright orange to deep red, is directly linked to their structure. The double carbon-carbon bonds interact with each other in a process called conjugation. As the number of double bonds increases, the wavelength of the absorbed light increases, giving the compound an increasingly red appearance.
560000
maybe yellow jaundice hence yellow
765881
The liquid should be clear...litmus paper is white usually...turns pink to red when in an unbalanced PH soulution....Yukoneze
558469
The extensive researches of scientists at the plant industry station at Beltsville,yale and Duke university and at several research institutes have culminated in the isolation of a blue or yellow green proteinaceous pigment, called phytochrome which is the primary receptor of the visible radiation. These are photosensitive photoreceptor found in almost all flowering plants.It was discovered by Borthwick et al (1952) and isolated by Butler et al (1959) from etiolated seedlings of maize.It exists in two interconvertible states, blue and yellow green,Pr and Pfr. Pfr is associated with cellmembrane while proccurs diffused in cytosol.It causes germination of seeds, inhibit flowering in SDP and in LDP plants.Pr absorbs light at 660nm and is changed to Pfr or P730. The latter absorbs light of 730nm and is changed back to Pr quickly.It is required in seed germination of some olants, bud dormancy, leaf abscisson,synthesis of gibberellins and etylene,prevention of photooxidation,photoperiodism and morphogenesis.Pfr is essential for seed germination.Pr is inactive form whil Pfr is active form.
1134337
the color of the food is recolored by the bile juice . bile juice absorbs the color pigments in turn produces yellow pigment that colors the material . \n10 points pls .
198892
There is no such colorimetric estimation but there is a way to identify if your test is not going wrong. U need to look into the colour when it is becoming greenish from orange (that of potassium dichromate+mixtures). If it turns to green then add some more dichromate (please note that u should be aware of how much you are adding). Then continue your test. This might give you result.
48983
phosphorescence, this link should tell you.
803736
A universal indicator is simply something that will have a color change over a wide range of pH.  The most common universal indicator will show red at a very low pH (acidic) spanning to blue for very high pH ( basic).  Look at this web site for explanation.
888160
The same thing that gives a banana it's yellow color?
844268
how were you measuring the pH? if it was a pH meter maybe it wasn't calibrated correctly/ recently?? or if it was with litmus paper.... maybe it went bad? I'm not sure if it can... check and see if there could have been an expiration date. i don't think temperature would have that drastic of an effect unless you did the experiment at pH7 and a seriously high (like about 60C) temp and the other ones at room temp or 37C (body temp)... sorry i cant help anymore then that, that's very strange!
639263
A) indicator\nAn indicator is a substance that tells you how acidic or basic a solution is by a visual color change, and because a high concentration of H+ ions is the same thing as high acidity, A is the answer.
626723
Lithimus paper is used to gage pH level.  An acid turns red lithimus paper blue and a base turns blue lithimus paper red.
367522
For pH3; Citrate buffer (Sodium citrate/citric acid) \n\nFor pH 8.75; Borate buffer (sodium tetraborate/boric acid), or TRIS [tris(hydroxymethyl)aminomethane]\n\nFor pH9.3; borate buffer, or carbonate buffer (carbonate/bicarbonate)
695914
Chemical laboratory supply houses carry it.  Try Alfa Aesar, they have it:\n\nhttp://www.alfa.com
611155
You should be able to monitor this reaction by tlc, looking for the disappearance of the alkyl halide or the appearance of the alkylated product.  a tlc stain of phosphomolybdic acid is very good for nitrogen containing compounds as they stain a distinct color from others.