revision for EOTT

Página 1

Ionic equation for neutralisation:

H+(aq) + OH-(aq) ---> H2O (l)

Acids always have hydrogen ions present (H+)

alkalis always have hydroxide ions (OH-)

The salt formed when sodium hydroxide reacts with sulphuric acid is Sodium Sulphate

The balanced symbol equation for copper (ll) oxide and sulphuric acid is:

CuO + H2SO4 = CuSO4 + H2O

Reactions of magnesium with ethanoic acid:

fizzing/bubbles of gas

heat given out

magnesium eventually disappears

solution remains colourless

A salt is a neutral substance which is made up of an acid and an alkali

Formula for potassium nitrate: KNO3

2 compounds which react to give potassium nitrate:

potassium and nitric acid

Reagent used to test for the presence of sulphate in copper sulphate:

Barium chloride and the result will be a white precipitate

To determine pH:

Add some U.I to the sample then compare this to the pH scale

A weak acid: lemon juice

a strong alkali: sodium hydroxide

neutral: water

Box B: corrosive

Observations of Copper (ll) carbonate and hydrochloric acid:

blue/green powder dissolves to a clear green solution

fizzing

Balanced equation of copper (2) carbonate and hydrochloric acid:

2HCl + CuCO3 = CuCl2 + H2O + CO2

Removal of CuCO3 from salt:

filtration

Flame Test:

clean a nichrome wire by dipping it into conc. HCl

hold the wire in a hot flame to clean

dip the clean nichrome wire into the conc. HCl again and then into the unknown solid

hold the wire in a blue bunsen flame

observe the colour of the flame

lilac flame: K+ (potassium)

yellow percipitate: NA+ (sodium)

New Page

New Page