PPT Slide

Compounds formed from polyatomic ions

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• Learn the formulas and the names of some common  polyatomic ions given in Table 2.5 .

• The formula for potassium nitrate is KNO3 : each K+  balances one nitrate NO3ñ .

• The formula for sodium carbonate is Na2CO3 : two Na+  balance one CO32ñ .

• If two or more of the same polyatomic ion are present in a  formula, the ion appears in parentheses with the subscript  written outside.

• For example, calcium nitrate, which contains one Ca2+ and  two NO3ñ ions, has the formula Ca(NO3)2.

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