sboh3 is soluble in naoh ?
Answers
Answer:
Antimony, Sb3+
Most common oxidation states: +3, +5
M.P. 630o
B.P. 1380o
Density 6.69 g/cm3
Characteristics: Brittle, silvery. Not very active, but reacts with oxygen, sulfur and chlorine at high temperatures.
Characteristic reactions of Sb3+:
(Sb(III) is the more stable oxidation state.)
Chloride Ion:
No reaction observable, but will be present as SbCl4.
Aqueous Ammonia:
Sb(III) reacts with aqueous ammonia to precipitate white Sb(OH)3.
Sb3+(aq) + 3NH3(aq) + 3H2O(l) <==> Sb(OH)3(s) + 3NH4+(aq)
Sodium Hydroxide:
Sodium hydroxide also precipitates Sb(OH)3, which is amphoteric and dissolves in an excess of hydroxide and in acids.
Sb3+(aq) + 3OH(aq) <==> Sb(OH)3(s)
Sb(OH)3(s) + OH(aq) <==> Sb(OH)4(aq)
Sb(OH)3(s) + 3H+(aq) <==> Sb3+(aq) + 3H2O(l)
Hydrogen Sulfide:
Under moderately acidic conditions, H2S precipitates red Sb2S3.
2SbCl4(aq) + 3H2S(aq) <==> Sb2S3(s) + 6H+(aq) + 8Cl(aq)
This sulfide is soluble in solutions of hot NaOH which contain excess sulfide ion and in hot, concentrated (12 M) HCl.
Sb2S3(s) + 3S2(aq) <==> 2SbS33(aq)
Sb2S3(s) + 6H+(aq) + 8Cl(aq) <==> 2SbCl4(aq) + 3H2S(aq)
Water:
Solutions of antimony(III) chloride in HCl react when added to excess water to form the basic, white, insoluble salt SbOCl.
SbCl4(aq) + H2O(l) <==> SbOCl(s) + 2H+(aq) + 3Cl(aq)
Reducing Agents:
In the presence of HCl, either aluminum or iron will reduce Sb3+ to Sb metal, which will be deposited as black particles.
SbCl4(aq) + Al(s) <==> Sb(s) + Al3+(aq) + 4Cl(aq)
No Reaction:
SO42-
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