What is an acid? Write four properties of acids by giving examples.



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An acid is a chemical species that donates protons or hydrogen ions and/or accepts electrons. Most acids contain a hydrogen atom bonded that can release (dissociate) to yield a cation and anion in water. The higher the concentration of hydrogen ions produced by an acid, the higher its acidity and the lower the pH of the solution.

Properties of acids are:
  • Acids change the colour of litmus from blue to red.
  •  Acids can conduct electricity due to the presence of ions.
  •  Some Acids are highly corrosive in nature which means that they corrode or rust metals.
  • Acids tend to evolve hydrogen gas whilst reacting with an active metal such
  •  The pH value of acid is from 0-6.

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