University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2022
Views:

417

Pages:

6
Author:

Carissa Thomas

Writing salts chemical formulae Writing salts formulae We want to write the formula of the salt Barium Chloride. 1. Order the symbols of each element ion as CationAnion-assign charges to them Ba2+ Cl2. Under the cation at right, write the number of charges on the anion. 3. Under the anion at right, write the number of charges on the cation. Ba12+ Cl24. Remove the charges over the ions and combine symbols together with their ratios of the numbers you had written down them. Delete number if =1. BaCl2 How to write salts (polyatomic anions-cations example) We want to write the formula of the salt Ammonium carbonate. 1. Order the symbols of each element ion as Cation-Anionassign charges to them NH4+ CO322. Under the cation at right, write the number of charges on the anion. 3. Under the anion at right, write the number of charges on the cation. 4. Use parenthesis if the written number >1 (NH4+)2 CO32- 1 5. Remove the charges over the ions and combine symbols together with their ratios of the numbers you had written down them. Delete number if =1. (NH4)2CO3 Try to write Sodium Chloride Aluminum sulfate Calcium carbonate Try to write Sodium Chloride Na+ Cl-> Na1 Cl1 -> NaCl Aluminum sulfate Al3+ (SO4)2- -> Al2 (SO4)3 -> Al2(SO4)3 Calcium carbonate Ca2+ (CO3)2- -> Ca2 (CO3)2 -> Ca(CO3) -> CaCO3 Stocks system • For metals with multiple oxidation number. • Such as Iron: Fe2+ / Fe3+ (ferrous/ferric) • A roman number is written after the name of metal to indicate the required oxidation number. For example : Ferric chloride = Iron (III) chloride= FeCl3 Ferrous chloride = Iron (II) chloride = FeCl2