Concentrated sulfuric acid reacted with copper. The gas released during this process was completely absorbed by an excess

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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