reactions of acids

• REACTIONS OF ACIDS P1 - in terms of pH, what is an acid?


  a solution with a pH less than 7.
• REACTIONS OF ACIDS P1 - In terms of pH, what is a neutral solution?

  a solution with a pH of 7.
• REACTIONS OF ACIDS P1 - in terms of H+ ions, what is an acid?


  a substance that releases H+ ions when dissolved in water.
• REACTIONS OF ACIDS P1 - what are the names and formulae of three main acids?

  hydrochloric acid, HCL, sulphuric acid, H2S04, nitric acid, HNO3.
• REACTIONS OF ACIDS P1- how do you measure the pH of a substance?

  universal indicator of pH probe.
• REACTIONS OF ACIDS P1 - what is a strong acid?

  an acid where the molecules completely ionise in water.
• REACTIONS OF ACIDS P1 - what is a weak acid?

  an acid where the molecules formed when a metal ion takes the place of a hydrogen ion in an acid.
• REACTIONS OF ACIDS P1 - what are the products of a reaction between a metal and an acid?

  salt + hydrogen.
• REACTIONS OF ACIDS P1 - what are the products of a reaction between a metal oxide and an acid?

  salt + water
• REACTIONS OF ACIDS P1 - what is a base?

  a substance that reacts with acids in neutralisation reactions.
• REACTIONS OF ACIDS P1 - what is a neutralisation reaction?

  a reaction between an acid and a base to produce water.
• REACTIONS OF ACIDS P1 - how can you obtain a solid salt from a solution?

  crystallisation.
• REACTIONS OF ACIDS P1 - when an acid reacts with a metal, which species is oxidised?


  the metal.
• REACTIONS OF ACIDS P1 - when an acid reacts with a metal, which species is reduced?

  hydrogen.
• REACTIONS OF ACIDS P1 - what is the ionic equation for a reaction between an acid and an alkali?


  H+ + OH- --> H2O