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Reactions of Strontium
Reactions with water
Strontium reacts slowly with water. to form strontium hydroxide, Sr(OH)2 and hydrogen gas. The strontium metal sinks in water and after a short while bubbles of hydrogen are evident, stuck to the surface of the metal.
  Sr(s) + 2H2O(g)Sr(OH)2(aq) + H2(g)
Reactions with air
Strontium is a silvery white metal. The surface of strontium metal is covered with a thin layer of oxide that helps protect the metal from attack by air, but to a lesser extent than the corresponding layer in magnesium. Once ignited, strontium metal burns in air to give a mixture of white strontium oxide and strontium nitride.
  2Sr(s) + O2(g)2SrO(s)
  3Sr(s) + N2(g)Sr3N2(s)
Reactions with halogens
Strontium is very reactive towards chlorine, bromine and iodine and burns to form strontium(II) dihalides. The reaction with bromine takes place at about 400°C and that with iodine at a dull red heat.
  Sr(s) + Cl2(g)SrCl2(s)
  Sr(s) + Br2(g)SrBr2(s)
  Sr(s) + I2(g)SrI2(s)
Reactions with acids
Strontium dissolves readily in dilute or concentrated hydrochloric acid to form solutions containing the aquated Sr(II) ion together with hydrogen gas.
  Sr(s) + 2HCl(aq)Sr2+(aq) + 2Cl-(aq) + H2(g)
Reduction Potentials
Balanced half-reaction E0 / V
Sr2+ + 2e-Sr(s) -2.89