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We’ll go over the given example in video form. First of all, we’ll just mention the basic rules for naming a compound that contains a polyatomic ion.
Naming Compounds with
a Metal and a Polyatomic Ion
The first rule is, the name of a polyatomic ion does not change in any way when it is used in a compound name. Its name is the same in a compound as it is on an ion table.
Rules for Naming Compounds with Polyatomic Ions
1. The name of a polyatomic ion does not change when it is used in a compound name.
2. Single elements follow the same naming rules as they do in other compounds.
The second rule is, single elements that are not in polyatomic ions, follow the same rules as they do in other compounds.
Rules for Naming Compounds with Polyatomic Ions
1. The name of a polyatomic ion does not change when it is used in a compound name.
2. Single elements follow the same naming rules as they do in other compounds.
Here is an example, we’re asked to name the compound NaHCO3.
Name the compound with the formula NaHCO3
We see that NaHCO3 has 4 elements (click) sodium, hydrogen, carbon, and oxygen. Therefore, it must contain a polyatomic ion.
NaHCO3
4 Elements
Name the compound with the formula NaHCO3
NaHCO3
Looking on the table, we see that Na in the formula,
Name the compound with the formula NaHCO3
NaHCO3
Is from the single ion sodium, Na plus. Sodium has only one possible charge, so a roman numeral is not included in the name of this compound
Name the compound with the formula NaHCO3
NaHCO3
We see that the remainder of the formula is HCO3.
Name the compound with the formula NaHCO3
NaHCO3
Which is a polyatomic ion called the hydrogen carbonate, or bicarbonate ion.
Name the compound with the formula NaHCO3
Na is the metal sodium
NaHCO3
sodium bicarbonate
Name the compound with the formula NaHCO3
Sodium has only one possible charge (click) so there is no roman numeral after sodium in the name
NaHCO3
sodium bicarbonate
Name the compound with the formula NaHCO3
Sodium has only one possible charge so there is no roman
numeral after sodium in the name
The formula ends with the polyatomic ion HCO3, (click) which is called either hydrogen carbonate,
sodium hydrogen
carbonate
Name the compound with the formula NaHCO3
NaHCO3
Or bicarbonate
sodium bicarbonate
Name the compound with the formula NaHCO3
NaHCO3
So the name of this compound can be either sodium hydrogen carbonate
sodium bicarbonate
Name the compound with the formula NaHCO3
NaHCO3sodium hydrogen
carbonate or
Or sodium bicarbonate.
sodium bicarbonate
Name the compound with the formula NaHCO3
NaHCO3sodium hydrogen
carbonate or
Remember the rule is, polyatomic ions do not change their name in any way when they form compounds, so hydrogen carbonate and bicarbonate do not change.
sodium bicarbonate
Name the compound with the formula NaHCO3
NaHCO3sodium hydrogen
carbonate Polyatomic ions do not change their name.
So the final answer is: the name of this compound is either (click) sodium hydrogen carbonate
sodium bicarbonate
Name the compound with the formula NaHCO3
sodium hydrogen
carbonate
Or sodium bicarbonate. Both names are acceptable.
sodium bicarbonate
Name the compound with the formula NaHCO3
sodium hydrogen
carbonate
