Group 2: Alkaline earth metals
Read our general notes on Risk Assessment
Sorted FAQs on Group 2: Alkaline Earth Metals
This topic has attracted a quite lot of questions to React over the years. To help you find the ones of most interest to you more easily, whether they are about background theory or a particular experiment, we have sorted the FAQs under several headings below, with a direct link to each question and answer.
Many students have based their investigations on the reaction of Mg with acids - for Re:act tutorials on this topic see 'Metals + Acids' investigations
1. Properties & Uses
•Why Mg density < Fe?
•Uses for Mg-compounds
•What is the practical use of magnesium ethanoate?
•Colour of Ca(OH)2 solution?
•Barium sulphate: toxic?
2. Reaction with water
•Reaction of Ca: observations?
•Mg + steam: ideal conditions?
3. Reaction with acids
•Mg + HNO3: mechanism?
•Reaction of Be with acid
•Mg + ethanoic acid: equation?
•% purity of Mg: method
4. Group trends
•Group 2 sulphates and hydroxides: solubility trends and reasons
•Decomposition of nitrates and carbonates: effect of cation radius?
•Nitrates and carbonates of Groups 1 & 2
5. Magnesium carbonate
•Finding % MgCO3: method?
•% MgCO3 in indigestion tablets: which acid to use?
•% Mg CO3 in indigestion tablets: HCl vs H2SO4?
•MgCO3: titration with sulphuric acid?
•Methods to determine MgCO3?
•How much HNO3 to use to react with MgCO3
•Determination of MgCO3 in indigestion tablets: presence of CaCO3?
•Methods to determine MgCO3 in indigestion tablets?
•Mg + HCl: how and why products formed?
•Methods to determine MgCO3 in indigestion tablets?
•Mechanism for thermal decomposition?
•MgCO3 back titration: calculations?
•Thermal stability of carbonates
6. Limestone and limewater
•Decomposition of limestone and formation of limewater: how?
•Solubility of calcium hydroxide: impurity problems?
•Solubility of hydroxides: effect of source?
•Calcium carbonate + methanoic acid: reaction equation?
•Calcium hydroxide + silver nitrate: brown ppt?
•Solubility of Ca(OH)2: planning
7. Hard water
•Hard water: EDTA titration after softening with sodium carbonate
•EDTA titration of Ca2+: use of KOH?
•Bonding in Ca2+-EDTA complex?
•Hard water: why no lather?
•Use of amount of lather to determine hardness
•Conversion of concentration to ppm
8. Miscellaneous
•Identifying hydroxides by titration
•Enthalpy of formation for Mg-ethanoate?
•Which more soluble: calcium or silver oxalate?
•Displayed formula for MgSO4
•MgSO4: finding % purity of MgSO4 + KNO3 mixture
•Negative entropies of M2+ ions
•BaSO4 in the body
Rate this page or react
Share your views on this page, 0 ratings so far
0
updated: 13 August 2008
