Question

Give the chemical formula for each of the following ionic compounds: (a) sodium phosphate, (b) zinc nitrate, (c) barium bromate, (d) iron(II) perchlorate, (e) cobalt(II) hydrogen carbonate, (f) chromium(III) acetate, $(\mathrm{g})$ potassium dichromate.

Short answer

The chemical formulas for the given ionic compounds are: (a) Sodium Phosphate: ${\text{Na}}_3{\text{PO}}_4$ (b) Zinc Nitrate: $\text{Zn}({\text{NO}}_3{)}_2$ (c) Barium Bromate: $\text{Ba}({\text{BrO}}_3{)}_2$ (d) Iron(II) Perchlorate: $\text{Fe}({\text{ClO}}_4{)}_2$ (e) Cobalt(II) Hydrogen Carbonate: $\text{Co}({\text{HCO}}_3{)}_2$ (f) Chromium(III) Acetate: $\text{Cr}({\text{C}}_2{\text{H}}_3{\text{O}}_2{)}_3$ (g) Potassium Dichromate: ${\text{K}}_2{\text{Cr}}_2{\text{O}}_7$

Step-by-step solution

(a) Sodium Phosphate

Sodium ion has a charge of $+1$, and phosphate ion has a charge of $-3$. To form the ionic compound sodium phosphate, we need 3 sodium ions to balance with the charge of 1 phosphate ion. The chemical formula is therefore given by ${\text{Na}}_3{\text{PO}}_4$.

(b) Zinc Nitrate

Zinc ion has a charge of $+2$, and nitrate ion has a charge of $-1$. We need 2 nitrate ions to balance with the charge of 1 zinc ion. The chemical formula for zinc nitrate is given by $\text{Zn}({\text{NO}}_3{)}_2$.

(c) Barium Bromate

Barium ion has a charge of $+2$, and bromate ion has a charge of $-1$. We need 2 bromate ions to balance with the charge of 1 barium ion. The chemical formula for barium bromate is given by $\text{Ba}({\text{BrO}}_3{)}_2$.

(d) Iron(II) Perchlorate

Iron(II) ion has a charge of $+2$, and perchlorate ion has a charge of $-1$. We need 2 perchlorate ions to balance with the charge of 1 iron(II) ion. The chemical formula for iron(II) perchlorate is given by $\text{Fe}({\text{ClO}}_4{)}_2$.

(e) Cobalt(II) Hydrogen Carbonate

Cobalt(II) ion has a charge of $+2$, and hydrogen carbonate ion has a charge of $-1$. We need 2 hydrogen carbonate ions to balance with the charge of 1 cobalt(II) ion. The chemical formula for cobalt(II) hydrogen carbonate is given by $\text{Co}({\text{HCO}}_3{)}_2$.

(f) Chromium(III) Acetate

Chromium(III) ion has a charge of $+3$, and acetate ion has a charge of $-1$. We need 3 acetate ions to balance with the charge of 1 chromium(III) ion. The chemical formula for chromium(III) acetate is given by $\text{Cr}({\text{C}}_2{\text{H}}_3{\text{O}}_2{)}_3$.

(g) Potassium Dichromate

Potassium ion has a charge of $+1$, and dichromate ion has a charge of $-2$. We need 2 potassium ions to balance with the charge of 1 dichromate ion. The chemical formula for potassium dichromate is given by ${\text{K}}_2{\text{Cr}}_2{\text{O}}_7$.