Make the equation: a) Sodium – Sodium hydroxide – Sodium sulfide – Sodium chloride – Sodium sulfate;

| February 10, 2021 | education

Make the equation: a) Sodium – Sodium hydroxide – Sodium sulfide – Sodium chloride – Sodium sulfate; b) Magnesium – Sulfate magnesium – Magnesium hydroxide – Magnesium oxide – Magnesium chloride; c) Lead – Lead (II) oxide – Lead (II) nitrate – Lead (II) hydroxide – Lead (II) oxide – Lead (II) sulfate; d) Sulfur – Hydrogen sulfide – Potassium sulfide – Potassium chloride – Hydrochloric acid.

a) 1. Formation of alkali.
2Na + 2H2O = 2NaOH.
2. Obtaining sodium sulfide.
2NaOH + H2S = Na2S + 2H2O.
3. Reaction of exchange.
Na2S + MgCl2 = 2NaCl + MgS.
4. Obtaining sodium sulfate.
2NaCl + H2SO4 = Na2SO4 + 2HCl.
b) 1. Magnesium sulfate.
Mg + H2SO4 = MgSO4 + H2.
2. Magnesium hydroxide.
MgSO4 + 2NaOH = Mg (OH) 2 + Na2SO4.
3. Decomposition of hydroxide to oxide.
Mg (OH) 2 = MgO + H2O.
4. Magnesium chloride.
MgO + 2HCl = MgCl2 + H2O.
c) 1. Passing oxygen through molten lead, 600 ° C.
2Pb + O2 = 2PbO.
2. Dissolution of lead oxide in dilute nitric acid.
PbO + 2HNO3 = Pb (NO3) 2 + H2O.
3. Lead hydroxide.
Pb (NO3) 2 + 2NaOH = Pb (OH) 2 + 2NaNO3.
4. Decomposition at 100-145 ° C.
Pb (OH) 2 = PbO + H2O.
d) 1. Hydrogen sulfide.
S + H2 = H2S.
2. Potassium sulfide.
H2S + 2KOH = K2S + 2H2O.
3. Decomposition of sulfide with acid.
K2S + 2HCl = 2KCl + H2S.
4. Hydrochloric acid.
2KCl + H2SO4 = K2SO4 + 2HCl.



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