Blue Ph Scale Litmus Paper

Examples of litmus paper color changes.

Blue ph scale litmus paper. Blue litmus paper can indicate an acid with a ph between 4 and 5 or lower. Distilled water has a ph of 7 so it is neutral. This is a pass or fail type of test that only works with acidic or basic liquids. In general litmus paper is red below a ph of 4 5 and blue above a ph of 8 3.

Litmus indicator solution turns red in acidic solutions blue in alkaline solutions and purple in neutral solutions. It turns blue litmus paper red. Sodium hydroxide is a base. Litmus paper comes as red litmus paper and blue litmus paper.

It turns red litmus. Sulfuric acid is obviously acidic in nature. 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. Acids turn blue litmus paper red.

A ph scale reading of 6 indicates a weak acid. If it comes in contact with an acidic or neutral substance it will remain red. Initially litmus paper is either red or blue. The main use of litmus is to test whether a solution is acidic or basic blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions with the color change occurring over the ph range 4 5 8 3 at 25 c 77 f.

Red litmus paper is meant to test only for an alkaline ph level. Litmus paper color chart. Bases turn red litmus paper blue. Colorful vector illustration in flat style isolated on white background.

When red litmus paper is placed into a basic substance it will turn blue. Note that 8 3 is alkaline red litmus paper can indicate alkalinity with a change to blue. The table shows. Red litmus paper turns blue if it comes in contact with a base alternatively blue litmus paper turns red with acids.

Ph scale diagram with corresponding acidic or alcaline values for common substances food household chemicals. Neutral litmus paper is purple. The blue paper changes to red indicating acidity somewhere between the ph range of 4 5 to 8 3. To test the ph of a substance dip a strip of litmus paper into the solution or use a dropper or pipette to drip a small amount of solution onto the litmus paper.

In relation to testing acids i recommend that you use blue litmus paper and if the substance you are testing is an acid the blue will change to red. A ph scale reading of 8 indicates a weak base. Litmus can also be prepared as an aqueous solution that functions similarly.