SODIUM POLYSULFIDES Na2Sn

Properties of Sodium polysulfides Na2Sn:

A mixture of Na2Sn (n = 2, 4, 5) has a yellow-brown color, Na2S2 - yellow. All Na2Sn - a very hard, melt without decomposition, melts - brown mobile liquid. Thermal stability decreases with increasing n. Readily soluble in water, hydrolyzed (on anion) is significantly weaker than Na2S. The aqueous solution is yellow. Oxidized in air. Reacts with acids and strong reducing agents.


Obtaining sodium polysulfides Na2(Sn):

2Na + E = Na2E (t>130° С, E = S, Se, Те)

2Na + nS = Na2(Sn) [-40° С, in the liquid NH3, n = 1, 2, 4, 5].

Na2S (solution) + (n-1)S = Na2(Sn) [boiling]

Na2S + S = Na2(S2).

Na2S + 3S = Na2(S4).

Na2S + 4S = Na2(S5).


Reactions with sodium polysulfides Na2(Sn):

Na2(Sn) = Na2S + (n-1)S (t>600° С).

Na2(Sn)[diluted] + 8H2O = 2[Na(H2O)2](+) + S2(2-)

Sn(2-) + H2O ↔ HSn(-) + OH(-).

Na2Sn + 2 НСl (diluted) = 2 NaCl + H2S↑ + (n - 1)S↓ (normal temp.)

Na2Sn + 2 НСl (conc) = 2 NaCl + H2Sn (- 15° С).

2 Na2Sn + 2H2O(cold) + O2 = nS(colloid) + 4NaOH (on the light)

2 Na2(Sn)(saturated, hot) + 3O2 = 2Na2SO3S + (2n - 4)S↓.

Na2(Sn) + H2O + SO2 = Na2SO3S + H2S↑ + (n - 2)S↓ (normal temp.).

Na2(Sn) + SnS2 = Na2[SnS3] + (n - 1)s↓

3 Na2(Sn) + As2S3 = 2Na3[AsS4] + (3n - 5)S↓.

Na2(Sn)+(n-1)Na[Sn(OH)3]+3(n - 1)NaOH = nNa2S+(n-1)Na2[Sn(OH)6].

 

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