1 / 8

Group 2 Elements & Compounds

Group 2 Elements & Compounds. Trends in Chemical Properties. Reaction with Water. Reactivity increases down the group N o of energy levels increases down group Outer “s” e - further from nucleus More easily lost. Metal Hydroxides. Milk of Magnesia

holden
Download Presentation

Group 2 Elements & Compounds

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Group 2 Elements & Compounds Trends in Chemical Properties

  2. Reaction with Water • Reactivity increases down the group • No of energy levels increases down group • Outer “s” e- further from nucleus • More easily lost

  3. Metal Hydroxides • Milk of Magnesia • suspension of Mg(OH)2 in water taken to neutralise acid indigestion . • Very weak alkali • Excess doesn’t disturb digestion (sparingly soluble)

  4. Metal Hydroxides • MgCl2(aq) + 2NaOH(aq)→ Mg(OH)2(s) + 2NaCl(aq) • white precipitate • BaCl2(aq) + 2NaOH(aq)→ Ba(OH)2(aq) + 2NaCl(aq) • no precipitate

  5. Metal Sulphates • Barium Sulphate – extremely insoluble in water • BaSO4 is opaque to X rays • Suspension of BaSO4 given to patients with digestive problems • X-ray will highlight problems

  6. Metal Sulphates • MgCl2(aq) + Na2SO4(aq) → MgSO4(aq) + 2NaCl(aq) • no precipitate • BaCl2(aq) + 2NaSO4(aq)→ BaSO4(s) + 2NaCl(aq) • white precipitate

  7. Test for Sulphate ions • Add dilute nitric acid (this prevents the formation of unwanted precipitates) • Add few drops of Barium nitrate Or • Add dilute hydrochloric acid (this prevents the formation of unwanted precipitates) • Add few drops of Barium chloride

  8. Test for Sulphate ions BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq) white precipitate If sulphate ions are present in solution a white ppt of barium sulphate will form. Ba(NO3)2(aq) + 2KSO4(aq) → BaSO4(s) + 2KNO3(aq) white precipitate

More Related