Sodium sulphide, or Na2S, is an inorganic chemical compound with the formula Na2S that has risen to prominence in the organic chemical industry. It’s a powerful alkaline solution that smells like rotten eggs when exposed to moist air. Despite the fact that the solid-state is yellow, the solution is colorless. It’s usually labeled as “sodium sulphide flakes” in the grades.
Sodium sulphide is a salt that is important in the organic chemistry sector. The chemical formula for sodium sulphide is Na2S, or its hydrate, Na2S9H2O. Anhydrous and hydrous salts are both colorless solids. Sodium sulphide is a water-soluble alkaline chemical with a strongly acidic solution.
When Na2S and its hydrates are exposed to damp air, hydrogen sulphide is produced. This discharge has a rotten egg odour. Sodium sulphide in solution has a yellow solid form and is sold in grades known as sodium sulphide flakes. Disodium sulphide is the IUPAC designation for sodium sulphide. Sodium sulphide has an oxidation number of -2, and its pH is 10.4.
The antifluorite structure is adopted by Na2S. This structure is created by swapping anions and cations’ locations. This means that the fluoride sites are occupied by Na+, whereas the Ca2+ sites are occupied by S2-.
Physical Properties
Chemical Formula
Na2S
Density
1.86 gm/cm3
Molar Mass
78.0452 g/mol
Autoignition temperature
> 480 °C (896 °F; 753 K)
Melting Point
1,176° C (2,149° F)
Odour
Odor of rotten eggs
Appearance
Anhydrous yellow crystalline solids
Oxidation Number
-2
pH
10.4
Solubility
Insoluble in ether; slightly soluble in alcohol
Chemical Properties
Na2S + H2O → 2Na+ + HS– + OH–
2Na2S + 3O2 + 2CO2 → 2Na2CO3 + 2SO2
2Na2S + S8 → 2Na2S5
Na2S + 4 H2O2 → 4 H2O + Na2SO4
Question 1: Is Sodium Sulphide soluble in water?
Answer:
Sodium is a group one element, and all group one elements are soluble in water, including sodium sulphide. Although sodium sulphide is very soluble, its solubility is temperature dependent. It is mildly soluble in alcohol but insoluble in ethers.
Another factor that contributes to sodium sulfide’s water solubility is that it is an ionic molecule that tends to dissociate its ions in water. Water dissolves roughly 12.4g/100 mL at 0°C. Sodium sulphide is only 18.6 g/100 mL soluble in water at 20°C. Furthermore, to make sodium sulphide soluble at 39g/100mL, 50°C is required for hydrolysis.
Question 2: How to make Sodium Sulphide?
Answer:
The salt can be made in the lab by reducing sulphur with sodium in anhydrous ammonia or by reducing sodium in dry THF with a catalytic quantity of naphthalene.
2 Na + S → Na2S
Question 3: Is Sulphate of Sodium an electrolyte?
Answer:
Sodium sulphate anhydrous is the sodium salt of sulfuric acid. In isosmotic solutions, an electrolyte replenisher called sodium sulphate anhydrous is employed to guarantee that distribution does not disrupt normal electrolyte balance or induce water and ion absorption or excretion.
The high melting point of sodium sulphide is due to the strong electrostatic interactions between sulphide molecules and sodium ions.
Question 4: What is the purpose of Sodium Sulphide?
Answer:
Sodium sulphide is largely utilised in the craft process of the pulp and paper industry. It improves the sulphate cooking process’ selectivity and speeds up the delignification process. It’s used as a bleaching agent in the textile business and to preserve developer solutions against oxidation in the photographic industry.
Question 5: What will happen when Sodium Sulphide interacts with Sulphur?
Answer:
Polysulfides are formed when sodium sulfide interacts with sulphur.
2Na2S + S8 → 2Na2S5
Question 6: What will happen when sodium sulfide is oxidized?
Answer:
When heated, it easily oxidised, creating sodium carbonate and sulphur dioxide.
2Na2S + 3O2 + 2CO2 → 2Na2CO3 + 2SO2
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