Describe the reactions of separate samples of aqueous cobalt(II) sulfate with aqueous sodium hydroxide,
and concentrated hydrochloric acid. For each reaction, link your description to an appropriate equation. State symbols are not required. (6)
Sodium hydroxide
_________ solution to _________ ________________
Reaction type = (deprotonation / precipitation / ______________ )
[Co(H₂O)₆]²⁺ + 2OH⁻ → [Co(H₂O)₄(OH)₂] + 2H₂O
Excess aqueous ammonia
Formation of) __________ /yellow/yellow-brown/brown _____________
Reaction type ____________________
Concentrated hydrochloric acid
Formation of dark _________ solution ____________________
[Co(H₂O)₆]²⁺ + 4Cl⁻(aq) → [CoCl₄]₂⁻ + 6H₂O /