กระดาษลิตมัส (Litmus Paper)

Properties

• Litmus paper for dipping to measure the acidity-basicity of solutions
  
• Packed in a good plastic box, 100 sheets/set, PL (Precision Laboratories) brand, made in the U.S.A.
  
• 0.6 cm wide paper strip, 4.7 cm long.
  
• Easy to use, using the principle of changing the color of the paper from red to silver or blue to red to indicate the acidity-basicity of the solution
  
• 100 sheets/set of red litmus paper, used to measure basic or alkaline solutions. If the paper changes from red to blue, it indicates that the substance is a base.
  
• 100 sheets/set of blue litmus paper, used to measure acidic solutions. If the paper changes from blue to red This indicates that the substance is acidic.
  
• Suitable for use in teaching science, basic acid-base measurement, or as a learning medium for acid-base experiments to measure food or fruit juice at home.

How to use

• Dip the litmus paper into the solution to be measured for about 1-2 seconds and watch the color of the paper change.
• Reading the results
  
• Red litmus paper turns blue when dipped into the solution, indicating that the substance is basic, pH >7.
  
• Blue litmus paper turns red when dipped into the solution, indicating that the substance is acidic, pH <7.
  
• If the paper does not change color, the solution is neutral, pH = 7.