Common Anions and Their Formulas (Page 1)

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flashcards pairing each ion name with its chemical formula.

Last updated 9:04 PM on 9/9/25
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28 Terms

1
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ammonium

NH4+

2
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nitrite

NO2-

3
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nitrate

NO3-

4
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sulfite

SO3^2-

5
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sulfate

SO4^2-

6
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hydrogen sulfate

HSO4- (aka: bisulfate)

7
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thiosulfate

S2O3^2-

8
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oxalate

C2O4^2-

9
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hydroxide

OH-

10
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phosphite

PO3^3-

11
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phosphate

PO4^3-

12
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hydrogen phosphate

HPO4^2-

13
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dihydrogen phosphate

H2PO4-

14
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perchlorate

ClO4-

15
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chlorate

ClO3-

16
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chlorite

ClO2-

17
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hypochlorite

ClO-

18
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bromate

BrO3-

19
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acetate

CH3COO-

20
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carbonate

CO3^2-

21
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hydrogen carbonate

HCO3-

22
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chromate

CrO4^2-

23
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dichromate

Cr2O7^2-

24
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permanganate

MnO4-

25
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peroxide

O2^2-

26
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cyanide

CN-

27
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cyanate

OCN-

28
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thiocyanate

SCN-