what constituent of acids is responsible in changing the color of the litmus paper?
116824
The hydroxonium ions H3O+ or simply H+ ions
30400
Sulfuric Acid- just learned that today... check the link for more info...\nit is a VERY strong acid!
364217
The paper is really a blend of linen and cotton and is not green.  It has red and blue fibers, of different lengths, running through it and the printing ink is green.  For more "trivia" please see:\nhttp://www.factmonster.com/ipka/A0774850.html
522216
Food colouring and bleach.
146333
Litmus test is used to find out if a certain (chemical) compund is acidic or basic.\nThere is a paper called litmus paper [blue and red litmus papers] which change the colors when they get in contact with acidic or basic substances.
318615
Safranin reacts with lignin and stains it red. Therefore only the lignified tissues such as Xylem and Sclrenchyma are turned red and all other tissues like Parenchyma, Collenchyma and Phloem remain colour less.
875344
1) Litmus is red in acid, blue in base...so it would turn red in rainwater (which is sl acidic, more or less depending upon atm contamination), blue in ammonia.\n2) AgCl precipitates out...KCl + AgNO3--->AgCl(ppt) + K+ + NO3-\n3) Zn is more active than Fe, so it plates out at the expense of Fe...Zn(+2) + Fe--->Zn(ppt) + Fe(+2)\n4) Depends on the type of battery...for the lead/acid type it is a reversible reaction between PbO in the plates and the H2SO4 electrolyte (in overly simple terms)\n.....Discharge: 2H(+) + SO4(-2) + PbO--->PbSO4 + H2O\n.....Charge: PbSO4 + H2O--->PbO + 2H(+) + SO4(-2)
140410
Not sure what you mean: a transparent substance that, when cut/sliced/whatever, will display coloration?\n\nDue to a chemical reaction with the atmosphere? Try a gelatinous material with a fugitive acid and phenolphtalein. As the acid evaporates, the pH will rise beyond the equilibrium of phenolphtalein. (Or some other indicator changing from colorless to colored, closer to neutral.)\n\n\nSometimes coloration can result from surface structure rather than dyes: the brilliant blue butterfly wings of some South-American species result from nano-structures eliminating all non-blue light. Assuming that your substance  is connected by a liquid of similar refractory index, the surface effect will only occur once the surface is hurt and the liquid is allowed to dry away.
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.
787458
HCl interacts with pentoses producing furfural or furan-2-carboxaldehyde. The reaction causes a bright pink color. This distinguishes pentoses (sugars containing five carbons) and hexoses (sugars containing six carbons).
269073
Acetic acid,Mineral acids
920363
it usually creates an acid  like HCl, HF, H2SO4
647043
(NH4)SO4 is ammonium sulphate and is a base and will turn litmus paper blue and phenolphthalein pinkish\nH2CO3 is Hydrogen carbonate and will produce no change in either as it is a neutral compound in both.
1116232
There are many types of pH indicators which will change color withint a certain range of pH values.  Many of these indicators might be dificult for the "common person" to get a hold of though.\n\nUsing Litmus paper is an easy way to test the pH of a substance.\nBased on the color change of the Litmus paper, a general idea of the pH can be determined.\n\nOne can also use other, natural, indicators.\nFor example, red cabbage contains a natural pH indicator which can be extracted by boiling (this will STINK up your whole house, best to do it outside of possible).\nhttp://chemistry.about.com/library/weekly/aa012803a.htm\n\nYou can also get pH probles whcih work by placing an electrode into the solution to be measured and getting a reading off of the either digital display or, in the case of cheaper probles, the value the needle points to on the meter.  Some of the "good qualitity" probles can be a little expensive, but a cheap substitute is a soil pH meter.  Although soil pH metes are really not designed to be used to measure a solution's pH and only have a limited range, it can work well for many applications.\n\nIf you want to get a numeric value for the pH,\nMy advice is to go with the soil pH meter if you dont plan on measuring anything which will have pH values below roughly 3 or 4 and nothing higher than about 8 or 9.  If you do plan to, you might want to go with a "real" pH meter.\n\nIf you just want a general range of the pH (whether something is just acidic or alkiline), then go with Litmus paper or some other form of cheap indicator (cabbage juice).
802465
carboxylic acid, as represented by -(C=O)-OH. For more info, check the source.
818456
paper is pulpified wood that's dried into thin sheets.  Any liquids (grease, water, etc) will soak into the mix and separate the fibers, causing it to become transparent.  Except with water, it will ultimately evaporate out.  Grease doesn't evaporate away at room temperature like water does, so the transparency remains.
959522
Starch forms a blue-black complex with iodine or triiodide.  As the Sodium sulfate reacts with the iodine, the color becomes clear.\n\nThis is called a visual indicator.