Some substances do not change the color of litmus paper because they are neither acid or nor base. They are called neutral substances.
Litmus paper only changes color with pH. Water is neutral, so the color of the litmus paper will change to the color that corresponds to pH 7, which is normally its original color.
Litmus paper change the color in acidic or basic solutions.
Litmus at a pH of 7 (which is nominally what an NaCl solution should have at room temperature) is a kind of purple color, somewhere between the "red" acidic form and the "blue" basic form. As with many indicators, the color change happens over a range rather than at a specific pH; the range for litmus is from around 5 (red) to 8 or so (blue).
The main use of litmus is to test whether a solution is acidic or alkaline. Wet litmus paper can also be used to test water-soluble gases; the gas dissolves in the water and the resulting solution colors the litmus paper. For instance, ammonia gas, which is alkaline, colors the red litmus paper blue. Chemical reactions other than acid-base reaction can also cause a color-change to litmus paper. For instance, chlorine gas turns blue litmus paper white - the litmus paper is bleached.[5] This reaction is irreversible and therefore the litmus is not acting as an indicator in this situation
as rain water is slightly acidic so will turn the blue litmus paper a little red.
The Blue Litmus paper will turn into Red, while the Red litmus paper will retain its color. So it only indicates that the said mixture is an acid.
There are different types of Litmus paper and so the exact color may differ for each of these types. Also, water itself is neutral when pure but most tap water is slightly basic so it depends on what you use. -- Tap water will not cause any colour change when tested with litmus paper. Blue litmus paper remains blue, the same goes for red litmus paper. Although the above statement says that tap water is slightly basic, the pH is still close to neutral and will not be significant enough to cause a colour change for the litmus paper.
carbon dioxide turns wet blue litmus red because carbon dioxide dissolves in water to form weak dibasic acid called carbonic acid
litmus paper nutral
a)sulfur dioxide b)hydrogen chloride c)potassium sulfate d)slaked lime
The water solution of iodine turn blue litmus paper to red.
the red litmus paper turns blue and the blue litmus paper remains blue indicating that the mixture is acidic>
litmus paper nutral
Litmus at a pH of 7 (which is nominally what an NaCl solution should have at room temperature) is a kind of purple color, somewhere between the "red" acidic form and the "blue" basic form. As with many indicators, the color change happens over a range rather than at a specific pH; the range for litmus is from around 5 (red) to 8 or so (blue).
water
THE COLOUR of the litmus paper will not change as a salt solution is neutral
Actually, some acids do burn litmus paper. Hydrochloric acid, for example, can burn paper, but the litmus on litmus paper shields the paper from the acid. Sulfuric acid, however, has dehydration properties, and would suck the water right out from the paper, charring it instantly.
The litmus paper changes to green because water has a neutral pH (7) andgreen is the neutral color.
Blue!! Because pool water is alkaline and alkalis turn red litmus paper into blue.