Litmus paper changes colors in response to an acidic or base solution. Acidic solutions result in a color change that is red. Neutral solutions yield a purple color.Know More
Solutions with pH levels below seven are considered acidic. Those with pH levels at seven are considered neutral. Litmus paper is paper that has been treated with a mixture of natural dyes known as lichens, or Roccella tinctoria.
Litmus paper is not the only method of using color change to detect pH level. One natural way to do so is to use red cabbage juice. It appears red in acidic solutions, blue in neutral ones and greenish-yellow is base solution with pH levels at 12.Learn more about Chem Lab
The thermotropic liquid crystals in a mood ring twist and change colors when the peripheral temperature of the wearer changes. If the outside air is very cold or the stone is damaged, the color of the stone turns black.Full Answer >
Cobalt chloride (CoCl2) is used in hygrometers because the substance changes colors when humidity levels change in the air, according to the National Weather Service. The chemical is readily available in elementary chemistry sets to demonstrate changes in heat and humidity within the Earth's atmosphere. Cobalt chloride changes from blue to pink on blotter paper.Full Answer >
Red cabbage juice is a good indicator of pH because it contains flavin, a pigment molecule that changes colors according to the concentration of hydrogen ions in a solution. The juice is prepared by soaking chopped red cabbage in boiling water for at least 10 minutes and then filtering the solution to eliminate any plant material.Full Answer >
Filter paper is used for filtering liquids in chemical and other scientific and automotive procedures. In chemistry, it is made of cellulose and is treated with hydrochloric and hydrofluoric acid, and it is particularly useful due to the fact that it burns out almost completely without leaving behind much ash, less than 0.0001 gram to be exact. In other applications, such as automotive procedures, filter paper can be made of other fiber materials, such as cotton.Full Answer >