Household goods that are bases. Image credit MediaWiki

Household goods that are bases. Image credit MediaWiki

ZIMSEC O Level Combined Science Notes: Introduction to Bases

  • Bases are different from acids
  • When a base dissolves in water it makes an alkaline solution
  • Metal oxides are bases
  • They dissolve in water to form alkaline solutions
  • These solutions are also known as alkalis
  • Non-metal oxides dissolve in water to form acidic solutions for example carbon dioxide dissolves in water to form carbonic acid (acid rain)
  • Alkaline (base) solutions turn litmus paper blue
  • They turn Universal indicator green, blue, purple or green
  • They do not have a sour taste
  • They do not fizz/effervesce when mixed with baking soda
AcidsBases
Have a sour tasteDo not have a sour taste
Turn litmus paper redTurn litmus paper blue
Effervesce/Fizz when mixed with sodium carbonate/sodium hydrogen carbonate (baking soda)Do not effervesce/Fizz when mixed with sodium carbonate/sodium hydrogen carbonate (baking soda)
Turn Universal Indicator: red, orange or yellowTurn Universal indicator: green, blue or purple

To access more topics go to the Combined Science Notes page.


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