How Is Na2so4 Prepared?

Na2SO4 can be prepared by various methods, including:

1. Neutralization reaction: Na2SO4 can be prepared by neutralizing sodium hydroxide (NaOH) with sulfuric acid (H2SO4). The equation for the reaction is:

2NaOH + H2SO4 → Na2SO4 + 2H2O

2. Double displacement reaction: Na2SO4 can also be prepared by reacting sodium chloride (NaCl) with sodium sulfate (Na2SO4) in water. The equation for the reaction is:

Na2SO4 + 2NaCl → 2Na2SO4 + 2Cl2

3. Thermal decomposition: Na2SO4 can be prepared by heating sodium sulfate decahydrate (Na2SO4.10H2O) to a temperature of around 300°C. The equation for the reaction is:

Na2SO4.10H2O → Na2SO4 + 10H2O

After preparation, Na2SO4 can be purified by recrystallization from water.