Inorganic chemistry class

1- The PKnl values Of some new metal cations have been measured. Classify the acidity of each cation,
and tell ‘f ‘t W‘“ Predominantly be in solution at pH 4., and then at pH 11.
(a) Heltonium ion, pKfl = 18.0
(b) aZhafiUmv pKa = ‘180,
(c) lawhomium, PKn _-. go;
(d) oyegbium, pKa = -3.0;
2. Fill in each blank with one of the following words: Increases, Decreases, Positive, Negative, Oxygen,
Hydrogen, Metal.
(a) The acidity of a cation as its charge increases because the charge of the
cation attracts the end of the water molecule. (b) The basicity of an anion as
its charge increases because the charge of the anion attracts the end of the
water molecule. (c) The acidity of a cation as its radius increases because the charge of
the cation is then further away from the atom of the water molecule. (d) The acidity of a
cation as its electronegativity increases. When this happens, the covalency of the cation-
oxygen bond , which allows more electrons to flow from the atom to the
atom.
3. In the quantitative analysis lab, you are titrating four unidentified anions in order to find their me
values. The ion names and their me values are beckwithide ion = -6,; campbellide ion = +10; gallianide
ion = O; udezide ion = +1 8.
(a) Which of these four anions is the most basic?
(b) If it later turns out that these four ions are in the same group of the periodic table, which one would
you expect to find at the top of the group? A
l’ t.
(c) Match each predominance diagram in the set below wrth the corresponding anion from the above IS

m2 pH 0 2 4 o x no 12 14 m

(Hydride) (Protonuwd Anion) {Anion}

(Prolonalcd anion) (Anion)
4. Numerous ions and other groups can act as ligands, forming bonds to metal ions. Thiocyanztc, 551V”,
has the capacity to bond through either its sulfur or nitrogen. When it bonds to a large, highly pOIafi‘flbk
metal ion such as Hg“ ,it attaches through sulfur ([Hg(SCN)4]-”);but when it bonds to smaller, less 1
polarizable metals such as Zn“, it attaches through nitrogen ([Zn(NCS)4]2’).How can this be explained? 1

I ‘ _I_ ..:.1 Lara

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Inorganic chemistry class

1- The PKnl values Of some new metal cations have been measured. Classify the acidity of each cation,
and tell ‘f ‘t W‘“ Predominantly be in solution at pH 4., and then at pH 11.
(a) Heltonium ion, pKfl = 18.0
(b) aZhafiUmv pKa = ‘180,
(c) lawhomium, PKn _-. go;
(d) oyegbium, pKa = -3.0;
2. Fill in each blank with one of the following words: Increases, Decreases, Positive, Negative, Oxygen,
Hydrogen, Metal.
(a) The acidity of a cation as its charge increases because the charge of the
cation attracts the end of the water molecule. (b) The basicity of an anion as
its charge increases because the charge of the anion attracts the end of the
water molecule. (c) The acidity of a cation as its radius increases because the charge of
the cation is then further away from the atom of the water molecule. (d) The acidity of a
cation as its electronegativity increases. When this happens, the covalency of the cation-
oxygen bond , which allows more electrons to flow from the atom to the
atom.
3. In the quantitative analysis lab, you are titrating four unidentified anions in order to find their me
values. The ion names and their me values are beckwithide ion = -6,; campbellide ion = +10; gallianide
ion = O; udezide ion = +1 8.
(a) Which of these four anions is the most basic?
(b) If it later turns out that these four ions are in the same group of the periodic table, which one would
you expect to find at the top of the group? A
l’ t.
(c) Match each predominance diagram in the set below wrth the corresponding anion from the above IS

m2 pH 0 2 4 o x no 12 14 m

(Hydride) (Protonuwd Anion) {Anion}

(Prolonalcd anion) (Anion)
4. Numerous ions and other groups can act as ligands, forming bonds to metal ions. Thiocyanztc, 551V”,
has the capacity to bond through either its sulfur or nitrogen. When it bonds to a large, highly pOIafi‘flbk
metal ion such as Hg“ ,it attaches through sulfur ([Hg(SCN)4]-”);but when it bonds to smaller, less 1
polarizable metals such as Zn“, it attaches through nitrogen ([Zn(NCS)4]2’).How can this be explained? 1

I ‘ _I_ ..:.1 Lara

Leave a Reply

Your email address will not be published. Required fields are marked *