Silicon oxide reacts with sodium hydroxide. The reaction products are sodium silicate and water.
SiO2 + 2 NaOH = Na2SiO3 + H2O
Sodium silicate is treated with iron (II) sulfate, we get a precipitate of iron (II) silicate and sodium sulfate in solution.
FeSO4 + Na2SiO3 = FeSiO3 + Na2SO4
Sodium sulfate when interacting with barium chloride forms a precipitate of barium sulfate and sodium chloride in solution.
Na2SO4 + BaCl2 = 2 NaCl + BaSO4
Sodium chloride is treated with silver nitrate. Silver chloride leaves the reaction medium as a precipitate, sodium nitrate remains in solution.
NaCl + AgNO3 = AgCl + NaNO3
Sodium nitrate can be obtained from sodium nitrite by treating the sodium nitrate melt with lead.
NaNO3 + Pb = NaNO2 + PbO
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