Formulas of Common Ions and Molecules

Practice questions and answers on the formulas of common ions and non-systematically named molecules from the lecture notes.

What is the formula of the ammonium ion?

[NH 4] ⁺

What is the formula of the caesium ion?

$$Cs^+$$

What is the formula of the hydrogen ion?

$$H^+$$

What is the formula of the lithium ion?

$$Li^+$$

What is the formula of the potassium ion?

$$K^+$$

What is the formula of the rubidium ion?

$$Rb^+$$

What is the formula of the silver ion?

$$Ag^+$$

What is the formula of the sodium ion?

$$Na^+$$

What is the formula of the barium ion?

$Ba^{2+}$

What is the formula of the calcium ion?

$$Ca^{2+}$$

What is the formula of the cobalt(II) ion?

$$Co^{2+}$$

What is the formula of the copper(II) ion?

$$Cu^{2+}$$

What is the formula of the iron(II) ion?

$$Fe^{2+}$$

What is the formula of the lead(II) ion?

$$Pb^{2+}$$

What is the formula of the magnesium ion?

$$Mg^{2+}$$

What is the formula of the manganese(II) ion?

$$Mn^{2+}$$

What is the formula of the nickel(II) ion?

$$Ni^{2+}$$

What is the formula of the strontium ion?

$$Sr^{2+}$$

What is the formula of the zinc ion?

$$Zn^{2+}$$

What is the formula of the aluminium ion?

$$Al^{3+}$$

What is the formula of the chromium(III) ion?

$$Cr^{3+}$$

What is the formula of the iron(III) ion?

$$Fe^{3+}$$

What is the formula of the bromide ion?

$$Br^{-}$$

What is the formula of the chloride ion?

$$Cl^{-}$$

What is the formula of the cyanide ion?

$$CN^-$$

What is the formula of the dihydrogenphosphate ion?

$$H_2PO_4$$

What is the formula of the ethanoate (acetate) ion?

$$CH_3COO$$

What is the formula of the fluoride ion?

$$F^-$$

What is the formula of the hydrogencarbonate ion?

HCO₃⁻

What is the formula of the hydrogensulfate ion?

HSO₄⁻

What is the formula of the hydroxide ion?

OH⁻

What is the formula of the iodide ion?

$$I^-$$

What is the formula of the nitrate ion?

NO₃⁻

What is the formula of the nitrite ion?

NO₂⁻

What is the formula of the permanganate ion?

MnO₄⁻

What is the formula of the carbonate ion?

CO₃²⁻

What is the formula of the chromate ion?

CrO₄²⁻

What is the formula of the dichromate ion?

Cr₂O₇²⁻

What is the formula of the hydrogenphosphate ion?

HPO₄²⁻

What is the formula of the oxalate ion?

C₂O₄²⁻

What is the formula of the oxide ion?

O²⁻

What is the formula of the sulfate ion?

SO 4²⁻

What is the formula of the sulfide ion?

$$S^{2-}$$

What is the formula of the sulfite ion?

SO₃²⁻

What is the formula of the nitride ion?

N³⁻

What is the formula of the phosphate ion?

PO₄³⁻

What is the formula of ammonia?

$$NH_3$$

What is the formula of water?

$$H_2O$$

What is the formula of hydrogen peroxide?

$$H_2O_2$$

What is the formula of ethanoic acid?

$$CH_3COOH$$

What is the formula of hydrochloric acid?

HCl

What is the formula of nitric acid?

$$HNO_3$$

What is the formula of carbonic acid?

$$H_2CO_3$$

What is the formula of sulfuric acid?

$$H_2SO_4$$

What is the formula of sulfurous acid?

$$H_2SO_3$$

What is the formula of phosphoric acid?

$$H_3PO_4$$