BUBBLES IN CHEMICAL REACTION?
1. Double displacement reaction of Cu(NO3)2 (aq) + 2NaOH (aq) → Cu(OH)2 (s) + 2NaNO3 (aq)
2. Thermal decomposition reaction of Cu(OH)2 (s) → CuO (s) + H2O (l)
3. Neutralisation reaction of CuO (s) + H2SO4 (aq) → CuSO4 (aq) + H2O (l)
4. Redox reaction of CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
There was several water washings and an acetone washing at the end. Can any of the chemicals above react and form bubbles?