solubilities of sulphates

• as you go down group 2 the solubility of metal hydroxides decreases
• use of magnesium sulphate

  epsom salts (bath salts)
• use of calcium sulphate

  gypsum or plaster (links to flue gas desulphurisation)
• use of barium sulphate

  barium meal / x-rays
• Ba2+ (aq) is toxic so how can BaSO4 be used for a barium meal?

  It’s insoluble therefore it can’t be absorbed into the bloodstream so the Ba2+ (aq) ion wont be formed