Concentrated sulfuric acid reacted with copper. The gas released during this process was completely absorbed by an excess of potassium hydroxide solution. The copper oxidation product was mixed with a calculated amount of sodium hydroxide until the precipitation ceased. The latter was dissolved in an excess of hydrochloric acid. Write the equations for the described reactions.
Cu + 2H2SO4 → CuSO4 + SO2↑ + 2H2O
SO2 + 2KOH → K2SO3 + H2O
CuSO4 + 2NaOH → NaSO4 + Cu(OH)2↓
Cu(OH)2 + 2HCl → CuCl2 + 2H2O
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