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Home :Companion Notes :Compounds :Polyatomic ionsPrint | Comment

Quiz
1. Periodate ion is used in staining procedures that improve the quality of microscopic images. The formula of the periodate ion is:
IO32-IO4-IO4-2IO3-HIO3-
2. Hard water contains high concentrations of calcium ions. The water is "softened" by treatment with carbonate ions, which precipitates the calcium as insoluble calcium carbonate. The formula of carbonate ion is:
HCO3-CO22-CO2-CO3-CO32-
3. Nitrates are used in making rocket propellants, fertilizers, dynamite, and fireworks. The formula of the nitrate ion is:
NO3-NO4-NO32-NO2-N2O3-2
4. Sodium peroxide can be used for oxygen generation in diving bells and submarines, since it reacts with carbon dioxide and produces oxygen gas. The peroxide ion has the formula:
O2-O2+O22-O3-O2-
5. If the selenate ion has formula SeO42-, the selenite ion might be:
SeO43-SeO4+2 SeO52-SeO32-SeO4-
6. Sodium bicarbonate is "baking soda", the active ingredient in many antacids. The formula of the bicarbonate ion is:
HCO32-CO32-H2CO3-HCO3-(CO3)24-
7. Sodium aluminate is used in fabric printing processes. If the formula is NaAlO2, the charge on the aluminate ion must be:
0-1+1-2+2
8. Hydroxide ion solutions are sprayed on pretzels to give them their characteristic texture; the ion is removed by reaction with carbon dioxide during baking. The hydroxide ion is:
HO3-HO2-HO2-OH-HO2+
9. Hypobromite compounds are used to treat water supplies that are heavily contaminated with bacteria. The formula of the hypobromite ion is:
BrO3-HBrO-BrO2-2BrO-BrO2-
10. Sodium sulfate occurs in nature as the minerals mirabilite and thenardite. The formula of the sulfate ion is:
SO42-HSO4-SO4-S2O3-2SO32-
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Copyright © 1997-2005 by Fred Senese
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Last Revised 06/11/07.URL: http://antoine.frostburg.edu/chem/senese/101/compounds/polyatomic-quiz.shtml