SODIUM HYDROSULFIDE NaHS

Properties of sodium hydrosulfide NaHS:

White, in the liquid state - black. It melts without decomposition, on further heating decomposes. Readily soluble in cold water (hydrolysis on the anion). Decomposed in the boiling solution. Neutralized by the alkali (as opposed to NH4HS). Attaches sulfur. A typical reducing agent, is oxidized by atmospheric oxygen.


Obtaining sodium hydrosulfide NaHS:

2Na + 2H2S (saturated) = 2NaHS↓ + H2↑ (in benzene).

Na2S + H2S (saturated) = 2NaHS.

H2S + NaOH (diluted) = NaHS + H2O.

H2S + 2 NaOH(conc.) = Na2S + 2H2O.

2H2S + 2Na = 2NaHS + H2  (150°C).

H2S + M(C2H5O) = MHS↓ + C2H5OH  (M = Li, Na, K; in ether)


Reactions with sodium hydrosulfide NaHS:

NaHS = Na2S + H2S (450-500°C).

NaHS·nH2O↓ ↔ NaHS (saturated) + nH2O      (normal temp., n >= 3).

NaHS (diluted) + 4 H2O (cold) = [Na(H2O)4](+) + HS(-).

HS- + H2O ↔ H2S + OH-.

2NaHS (solution) = Na2S + H2S↑   (boiling).

NaHS + НСl (diluted) = NaCl + H2S↑,

NaHS + 3HNO3 (conc.) = S↓ + 2 NO2↑ + NaNO3 + 2H2O.

NaHS + NaОН (conc.) = Na2S + H2O.

2n NaHS (solid) + (n - 1)O2 = 2 H2O + (2n - 4) NaOH + 2 Na2(Sn) (100-250°C).

NaHS (saturated, hot) + NaOH + (n - 1)S = Na2(Sn) + H2O


 

Did you know?

Halogens are the only group of elements that show all phases of matter at room temperature.