Three categories 1.Binary Ionic compounds 2.Binary Molecular
Compounds 3.Mineral Acids
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Lets see what you remember about naming ionic compounds...
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Name These Ionic Compounds... K 2 SO 4 potassium sulfate NaOCl
sodium hypochlorite PbO 2 plumbic oxide -or- lead (IV) oxide (NH 4
) 2 CrO 4 ammonium chromate
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Ionic compounds involve a metal cation and a non-metal anion
can also involve one or more polyatomic ions NB. The only
polyatomic cation is ammonium, NH 4 +
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For ionic compounds name cation first do NOT use prefixes
(mono, di, tri, etc) combine ions to form a neutral compound eg.
calcium phosphate Ca 2+ PO 4 3- Ca 3 (PO 4 ) 2 Check that
subscripts are in lowest terms.
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Criss-Cross method for Writing Ionic Formulae eg. Tin (IV)
sulfite (aka stannic sulfite) Its ions are... Sn 4+ SO 3 2-
criss-crossing charges gives... Sn 2 (SO 3 ) 4 But Waitnot in
lowest terms!! (Oh No!!) therefore Sn(SO 3 ) 2 is the formula
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Classical and Stock System for Multivalent Cations Fe 2+ iron
(II) [stock name] ferrous [classical name] Fe 3+ iron (III) [stock
name] ferric [classical name] NB. lower charged ion = _____ous;
higher = ___ic
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Some Other Multivalent Cations FormulaStock nameClassical name
Pb 2+ ______________________ lead (II)plumbous Pb 4+
______________________ lead (IV)plumbic Sn 2+
______________________ tin (II)stannous Sn 4+
______________________ tin (IV)stannic
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FormulaStock nameClassical name Cu + ______________________
copper (I)cuprous Cu 2+ ______________________ copper (II)cupric Hg
+ (Hg 2 ) 2+ ______________________ mercury (I)mercurous Hg 2+
_____________________ mercury (II)mercuric Mercury (l) does not
exist as Hg +.
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Consult handouts or textbook for list of the other multivalent
cations.
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name this new compound... Fe 2+ ______ Fe 2+ / \ Fe 2+ Fe 2+ |
| Fe 2+ Fe 2+ \ / Fe 2+________ Fe 2+ a ferrous wheel
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Some Anion Names are Similar... S 2- sulfide SO 3 2- sulfite SO
4 2- sulfate
More Practice: Ionic Nomenclature formulastock nameclassical
name ________ mercury (ll) chloride_______________ HgCl 2 mercuric
chloride ___________mercury (l) chloride_______________ Hg 2 Cl 2
mercurous chloride Why do we not reduce this to HgCl? The mercury
(l) ion is (Hg 2 ) 2+, NOT Hg +
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Binary Molecular Compounds Binary Molecular compounds made up
of two non-metals. Name ends in -ide. Use prefixes to indicate
quantity.
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Prefixes for Binary Molecular Cmpds. mono (1) di (2) tri (3)
tetra (4) penta (5) hexa (6) hepta (7) octa (8) nona (9) deca
(10)
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examples of Molecular Cmpds
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Mineral Acids An acid is a compound that liberates H + ions
when dissolved in water. Therefore, acids must contain hydrogen.
For now, acids have (aq) after their formula. HCl(g)vs.HCl(aq)
hydrogen chloride hydrochloric acid
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How does the name of each acid correlate to ending of anion
name? HCl(aq) Cl -, chloride hydrochloric acid H 2 SO 4 (aq) SO 4
2-, sulfate sulfuric acid HNO 2 (aq) NO 2 -, nitrite nitrous
acid
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Ending of anion name of acid determines name of acid 1. anion
ends in -ide hydro_____ic acid [hydrobromic acid, HBr(aq), Br -,
bromide] 2. anion ends in -ate _______ic acid [phosphoric acid, H 3
PO 4 (aq), PO 4 3-, phosphate] 3. anion ends in ite _______ous acid
[nitrous acid, HNO 2 (aq), NO 2 -, nitrite ]
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Examples of acids formulaname HClO 2 (aq)_______________
chlorous acid _______________ acetic (ethanoic) acid HC 2 H 3 O 2
(aq) H 3 PO 3 (aq)_______________ phosphorous acid
_______________carbonic acid H 2 CO 3 (aq)
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more examples of acids...
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Homework Do the practice problems and section review questions
in section 2.2 of your text, as well as in chapter and unit review.
You can also see whats on line. Good luck!!!!
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