Laboratory Experiments in Microbiology (11th Edition)
11th Edition
ISBN: 9780321994936
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 27, Problem 2CT
Summary Introduction
To determine:
The valency of N in NO3- and in NO2- and the atom gaining electron in nitrate reduction.
Introduction:
The ability of an element to form bond with another element to form a molecule is termed as valence. The valency of an atom is its number of electrons that can be donated or accepted to attain the Nobel gas configuration.
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In the electrolysis of aqueous sodium bromide, there are two possible anodic reactions: *2H2O(l) ——-> 02(g) + 4H+(aq) + 4e–, E° = 1.23V2Br–(aq) ——–> Br2(g) + 2e-2, E° = 1.08 VWhich reaction occurs at anode and why?
A base is added to a 0.050 M solution of MnCl2, raising the pH gradually. Calculate the pH of the
solution when 70 of the manganese has precipitated?
Table 5-7
Solubility-Product Constants, K, at 25°C
Fluorides
Chromates (cont.)
Ag, Cro,
PbCro,
Hydroxides (cont.)
Ni(OH),
Zn(OH),
Cu(OH),
Hg(OH)2
Sn(OH),
Cr(OH),
Al(OH),
Fe(OH),
Co(OH),
Sulfides
Baf,
MGF2
PbF,
SrF,
CaF,
2.4 x 10-6
1.9 x 10-12
1.6 x 10-16
8 x 10-8
X 10-8
7.9 x 10-10
3.9 x 10-11
2 x 10-16
4.5 X 10-17
4
1.6 x 10-19
X 10-26
X 10-27
6.7 x 10-31
Carbonates
NiCO,
CaCO,
BaCO,
SrCO,
CuCO,
ZnCO,
MNCO,
FeCo,
Ag,CO,
CdCo,
PbCO,
M9CO,
Hg,CO,
1.4 X 10-7
4.7 x 10-9
3.
Chlorides
1.6 x 10-9
PbCl,
AgCI
Hg,Cl,
х 10-33
X 10-38
2.5 x 10-43
1.6 x 10-5
X 10-10
2.5 x 10-10
2 x 10-1o
8.8 x 10-11
2.1 X 10-11
7
1.7 x 10-10
1.1 X 10-18
6.
Bromides
PbBr2
X 10-16
X 10-19
X 10-21
5 x 10-22
2.5 x 10-22
X 10-26
1.0 x 10-28
MnS
4.6 x 10-6
5.0 x 10-13
Fes
4.
AgBr
Hg,Br,
8.2 x 10-12
NiS
Cos
Zns
1.3 x 10-22
3
5.2 x 10-12
1.5 x 10-15
1 x 10-15
9.0 x 10-15…
Complete the following precipitation reactions using balanced chemical equations:
Chapter 27 Solutions
Laboratory Experiments in Microbiology (11th Edition)
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