Testing our pH indicator

After making the pH indicator today we tested it on different substances to make sure it worked. 

The results have shown that red cabbage is a good indicator of the pH of a substance.

  • Lemon and vinegar went pink which showed that they were acidic.
  • Tap water has shown a very slight alkalinity. 
  • A soil sample that we tested indicated that the soil was indeed slightly alkaline as it went blue in colour. 
  • Bi-carbonate soda turned green which indicated that it is alkaline.