How to use pH paper?
- Take a pipette and drop a few drops of the test liquid onto a piece of pH paper.
- Look at the color scale that comes with the pH paper and find out what pH the fluid you are testing is in.
- Make sure you read off directly. When the pH paper dries, the color changes.
- Rinse the pipette in water before using it for the next test to get accurate results on your measurement.
PH <7: acidic liquid pH = 7: neutral liquid pH> 7: basic liquid
What does the pH value tell us?
A liquid of pH 7 is a neutral liquid. Pure water has a pH of 7. When the pH is below 7, the liquid is acidic. Examples of acidic liquids are vinegar and citric acid. Other acidic liquids are cola or ketchup. Acidic fluids are harmful for your teeth. If the pH is above 7, the liquid is basic. Cleaning agents are often basic because they contain the base ammonia. Knowing the pH of a fluid can be important when dealing with chemical reactions. Many chemical reactions depend on a particular pH.