Acids and Alkalis.
The pH Scale and Universal Indicator.
pH 1 = Car battery acid or stomach acid.
pH 3 = Vinegar or Lemon Juice.
pH 4 = Acid rain.
pH 5 = Normal rain.
pH 7 = Pure water.
pH 9 = Washing-up liquid.
pH 10 = Pancreatic juice.
pH 11 = Soap powder.
pH 12 = Bleach.
pH 14 = Caustic soda (drain cleaner).
An Indicator is Just a Dye That Changes Colour.
The dye in the indicator changes colour depending on whether it's above or below a certain pH. Universal indicator is a very useful combination of dyes which gives the colours shown above. it's very useful for estimating the pH of a solution.
The pH Scale Goes From 0…