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What is the chemical formula for sodium sulfate?(1) Na2SO4 (2) Na2SO3(3) NaSO4(4) NaSO3

  • Mayya Alocci
  • Jul 24, 2023
  • 1 min read

June 2017 NY Regents Chemistry Exam


34 What is the chemical formula for sodium sulfate?

(1) Na2SO4

(2) Na2SO3 (3) NaSO4

(4) NaSO3


Solution: Sodium sulfate is an ionic compound that consists of a metal (sodium) and a polyatomic ion, sulfate. Table E on the Reference Table lists common polyatomic ions with their names, formulas and oxidation numbers. Sulfate is SO4 ^2-. The oxidation number for sodium can be found on the Periodic Table and is +1.

Putting the name together we write both parts with their oxidation numbers and then we criss cross the numbers and make them into subscripts.

Na^+1 SO4^2-

Na2SO4

Answer: 1


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