Strong and weak acids

• HCl - hydrochloric acid
• H2SO4 - Sulfuric acid
• HNO2 - Nitric acid
• Acids releases H+ ions in solution
• Alkalines release OH-ions in solutions
• A strong acid fully ionises in an aqueous solution (dissolved in water)
• Weak acids only partially ionise in an aqueous solution
• H2SO4 --> 2H+ +SO42-
• HNO3 --> H+ + NO3-
• Neutralisation - acids react with alkalis to produce salt and water

  H+ + OH- --> H2O
• Neutralisation:

  NaOH + HCl --> NaCl + H2O

  Na+ OH- + H+ Cl- --> Na+ Cl- + H2O

  OH- + H+ --> H2O
• The pH tells us about the concentration of the H+ ions present in a solution