group 2

• a function of Mg

  extraction of titanium, TiO2 reacted with chlorine gas then..

  • TiCl4 (g) + 2Mg (l) -> Ti (s) + 2MgCl2 (l)
• a function of Mg(OH)2

  • milk of magnesia
  • neutralises excess stomach acid
  • only slightly alkaline as its sparingly soluable
• a function of Ca(OH)2

  • "slacked lime"
  • neutralises acidic soil
  • Reducing the acidity of the soil prevents bacteria growth and increases the availability of important nutrients such as phosphorus
• a function of CaO

  • SO2 is produced when fossil fuels burned, SO2 is a pollutant
  • removal of SO2 from flue gases in the process of "wet scrubbing"

  CaO (s) + 2H2O (l) + SO2 (g) -> CaSO3 (s) + 2H2O (l)
• a function of BaSO4


  • barium meal
  • used in X Rays to see soft tissues
  • although BaSO4 is toxic, it doesn't matter as its insoluable in the blood
• what is the trend of reactivity when grp 2 elements react with water

  • Be = does not react
  • Mg= reacts very slowly
  • Ca= reacts steadily
  • Sr= reacts fairly quickly
  • Ba= reacts rapidly
• what is the trend in soluability for grp 2 hydroxides

  (goes least soluable to most soluable)

  • Mg(OH)2 = thick white precipitate (sparingly soluable)
  • Ca(OH)2 = white precipitate
  • Sr(OH)2 = thin white precipitate
  • Ba(OH)2 = very thin white precipitate
• what is the trend in soluability for grp 2 sulfates

  (goes most soluable to least soluable)

  • MgSO4 = no precipitate (completely dissolves)
  • CaSO4 = thin white precipitate (sparingly soluable)
  • SrSO4 = white precipitate
  • BaSO4 = thick white precipitate (insoluable)
• what is the test for sulfates

  1. add 1cm3 of dilute HCl (this removed any other ions like carbonates that can impact the test)
  2. Add 1cm3 of BaCl2 solution
  3. If sulfate ions are present a thick white precipitate (BaSO4) is formed