Where To Buy Litmus Paper Strips
The color must be compared with a chart to get a number and determine if the liquid is acidic, basic or neutral.
For example, if you are testing a citrus juice, the color change would happen around the 1 or 2 p H level (acidic) whereas water would change color around 7 (neutral).
Both Litmus paper and p H strips are small strips of paper coated with a chemical substance that will undergo a reaction when it comes in contact with the liquid being tested. Red Litmus paper turns blue if it comes in contact with a base, alternatively blue litmus paper turns red with acids.
This is a pass or fail type of test that only works with acidic or basic liquids.
Neutral litmus paper turns from purple to blue or red. Note: Not for measuring the p H of natural waters, such as streams, rivers, and lakes.
To measure p H in these waters, try p H and Total Alkalinity Water Test Strip, p H 6-9 (item #652729), or for a wider p H range, La Motte® Wide-Range p H Water Test Kit, p H 3.0-10.5 (item #652927).
Neutral solutions do not cause a change of color, although there are some brands of blue Litmus paper that will turn purple if the substance is neutral.
The p H strips determine the p H value whereas Litmus paper only indicates if the substance is acidic or basic (alkaline).Blue litmus paper turns red at p H 4.5 or less (acidic).Red litmus paper turns blue at p H 8.3 or more (basic).Litmus paper may be dampened with distilled water to give a color change for a gaseous sample.Gases change the color of the entire litmus strip since the whole surface is exposed.Low p H values are considered acidic, high values are called basic and values around 7 are neutral.People need to measure the p H because it affects most life forms, for example, a slight change in the soil’s p H can kill entire crops; minimum alterations in the p H of the human body can cause health problems.The litmus test is a quick method of determining whether a liquid or gaseous solution is acidic or basic (alkaline.) The test can be performed using litmus paper or an aqueous solution containing litmus dye. The blue paper changes to red, indicating acidity somewhere between the p H range of 4.5 to 8.3.(Note, however, that 8.3 is alkaline.) Red litmus paper can indicate alkalinity with a change to blue.There are 16 references cited in this article, which can be found at the bottom of the page.The p H scale measures how likely a substance is to give up protons (or H ions) and how likely that substance is to accept protons.