Question

question 13 of 14 determine the name for each of the ionic compounds from their formulas. cas: au₂o₃: k₂co₃: nipo₄: © macmillan learning

Explanation:

For $\ce{CaS}$:

Step1: Identify ions

$\ce{Ca^{2+}}$ (calcium ion) and $\ce{S^{2-}}$ (sulfide ion).

Step2: Name the compound

Combine the cation name and anion name. So it's calcium sulfide.

For $\ce{Au_{2}O_{3}}$:

Step1: Determine ion charges

Let Au charge be $x$. For $\ce{Au_{2}O_{3}}$, $2x + 3(-2)=0\implies 2x = 6\implies x = +3$. So $\ce{Au^{3+}}$ (gold(III) ion) and $\ce{O^{2-}}$ (oxide ion).

Step2: Name the compound

Use the stock system for the transition metal. So it's gold(III) oxide.

For $\ce{K_{2}CO_{3}}$:

Step1: Identify ions

$\ce{K^{+}}$ (potassium ion) and $\ce{CO_{3}^{2-}}$ (carbonate ion).

Step2: Name the compound

Combine cation and polyatomic anion names. So it's potassium carbonate.

For $\ce{NiPO_{4}}$:

Answer:

s:
$\ce{CaS}$: calcium sulfide
$\ce{Au_{2}O_{3}}$: gold(III) oxide
$\ce{K_{2}CO_{3}}$: potassium carbonate
$\ce{NiPO_{4}}$: nickel(III) phosphate