1)aluminum sulfate + potassium hydroxide 2) calcium chloride + sodium carbonate 3) potassium sulfate + sodium hydroxide?

1)
A gelatinous white precipitate of aluminum hydroxide is formed.
Full equation: Al₂(SO₄)₃(aq) + 6KOH(aq) → 2Al(OH)₃(s) + 3K₂SO₄(aq)
Net ionic equation: Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)

The precipitate re-dissolves in excess potassium hydroxide to form a colorless solution of potassium aluminate.
Full equation: Al(OH)₃(s) + KOH(aq) → K[Al(OH)₄](aq)
Net ionic equation: Al(OH)₃(s) + OH⁻(aq) → [Al(OH)₄]⁻(aq)


2)
A white precipitate of calcium carbonate is formed.
Full equation: CaCl₂(aq) + Na₂CO₃(aq) → CaCO₃(s) + 2NaCl(aq)
Net ionic equation: Ca²⁺(aq) + CO₃²⁻(aq) → CaCO₃(s)


3)
There is no reaction.