Final answer:
When MgI₂ dissolves in water, it produces Mg²⁺ and 2I⁻ ions. K₂CO₃ dissociates into 2K⁺ and CO₃²⁻ ions. HClO₄ dissociates into H⁺ and ClO₄⁻ ions. NaCH₃COO dissociates into Na⁺ and CH₃COO⁻ ions.
Step-by-step explanation:
When MgI₂ dissolves in water, it dissociates into Mg²⁺ and 2I⁻ ions. This is because MgI₂ is a salt and it breaks down into its constituent ions in aqueous solution.
When K₂CO₃ dissolves in water, it dissociates into 2K⁺ and CO₃²⁻ ions. Again, this is because K₂CO₃ is a salt and it dissociates into ions in water.
When HClO₄ dissolves in water, it dissociates into H⁺ and ClO₄⁻ ions. HClO₄ is a strong acid that completely ionizes in water.
When NaCH₃COO dissolves in water, it dissociates into Na⁺ and CH₃COO⁻ ions. NaCH₃COO is a salt and it dissociates into its constituent ions in aqueous solution.