Acids and bases AS90944 revision part 2

by | Aug 30, 2012 | school posts, Year 11, K-12

We are working through a practise paper from the Ministry website

You should have completed question 1 last night. Do question 2 tonight. See last night’s post for instructions on how to hand this work in.

Also revise writing chemical formulae, word equations, fully balanced chemical equations and the reactions of acids and bases by watching the embeded videos below. They are based on lessons and lesson notes I did with you earlier in the year. There is video of practical work you carried out when you were making salts by neutralising acids with bases.

Ions, ionic compounds, word equations and fully balanced chemical equations.

Neutralisation reactions and practical work you carried out. Acids bases and salts.

Neutralising acids with bases to form salts

by | Apr 12, 2011 | Uncategorized

Acids and water

  Acids react with water molecules to form hydrogen ions . Acidic solutions have an excess of hydrogen ions over hydroxide ions. The acids we commonly use in the laboratory are:

  • Hydrochloric, HCl
  • Sulphuric, H2SO4
  • Nitric, HNO3

.pH

  •  Neutralising acids with bases.

  • The acidity of an acid can be neutralised by removing the excess of hydrogen ions

Substances that remove hydrogen ions and neutralise acids are called bases.

Chemically all metal oxides and hydroxides are bases.

Bases that are soluble in water have a special name. They are called alkalis e.g. Sodium hydroxide and potassium hydroxide

 

 

 

Making a salt in the Laboratory.

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