Memorizing Polyatomic Ions: Formulas and Charges

This video tutorial focuses on memorizing polyatomic ions, essential for chemistry courses. It covers the naming conventions and differences between ions like nitrate, nitrite, and nitride, as well as sulfate, sulfite, and sulfide. The video also explains the naming of chlorine and bromine ions with varying oxygen levels, and introduces carbonate, phosphate, hydroxide, and ammonium ions. A review section includes a quiz to test knowledge of common polyatomic ions and their formulas.

What is the charge of a nitrate ion?

• +1

• -3

• -2

• -1

What is the name of SO4 2- ion?

• Sulfite

• Phosphate

• Sulfide

• Sulfate

Which ion has one less oxygen atom than sulfate?

• Sulfide

• Sulfite

• Phosphate

• Nitrate

Which of the following is a correct pair of ion name and its formula?

• Nitrate - NO2 -

• Sulfate - SO3 2-

• Carbonate - CO2 2-

• Perchlorate - ClO4 -

Which ion is known as hydrogen carbonate?

• CO2

• H2CO3

• CO3 2-

• HCO3 -

What is the formula for dihydrogen phosphate?

• H2PO4 -

• PO4 3-

• H3PO4

• HPO4 2-

What is the correct formula for ammonium?

• NH3

• NH4+

• NH2-

• NH4-

Which ion is called thiosulfate?

• SO4 2-

• SO3 2-

• S2O3 2-

• S2 2-