Litmus Paper

R50.10R89.69 Incl VAT

Litmus Paper

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Litmus paper is paper that has been treated with a specific indicator—a mixture of 10-15 natural dyes obtained from lichens (mainly Roccella tinctoria) that turns red in response to acidic conditions (pH 7).

  • Litmus paper is a tool used to test whether a substance is an acid or base. When a substance is dissolved in water, the resulting solution causes the litmus paper to change colour. 
  • The acidity or alkalinity of a solution is determined by the concentration of hydrogen ions, or power of hydrogen, expressed as a pH value.
  • A litmus test provides a quick result but cannot determine the level of acidity or alkalinity of a solution.

Performing Litmus Test

  • It gives the user a general indication of acidity or alkalinity as it correlates to the shade of red or blue that the paper turns.
  • 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 a solution onto the litmus paper. 
  • Blue  paper can indicate an acid with a pH between 4 and 5 or lower. Red paper can show a base with a pH greater than 8. If a solution has a pH between 5 and 8, it will show little color change on the  paper.
  • A base tested with blue paper will not show any color change, nor will an acid tested with red paper register a change in color

Limitations 

  • Using a litmus test is a quick and easy way to determine if a solution is acidic or alkaline. 
  • Litmus paper is inexpensive, portable and can test acidity and alkalinity using only with a small volume of a solution. 
  • However, it can’t provide the actual pH for a substance, other than indicating if the pH is roughly less than 5 or greater than 8. 
  • Litmus paper is not useful for testing substances with a pH that is closer to neutral.
Range

Litmus Paper Red 100/box, Litmus Paper Blue 100/box, Litmus Paper neutral 100/box

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