Question

The chemical reaction that are used in the anion spot tests in this experiment are the...

The chemical reaction that are used in the anion spot tests in this experiment are the most part simple precipitation or acid-base reactions. Given the information in each test procedure, try to write the net ionic equation for the key reaction in each test.

a. CO3 2-
b. SO4 2-
c. PO4 3- (Reactions are HPO4 2-, NH4+, MoO4 2-. and H+; products are (NH4)3PO4* 12 MoO3 and H2O; no oxidation or reduction occurs.)
d. SO3 -2
e. SCN-
f. Cl-
g. NO3- (Take as reactants Al and NO3-; as products NH3 and AlO2-; final equation also
contains OH- and H2O as reactants.)

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Answer #1

Anion spot test reactions are as follows,

a. CO3^2-

add a drop of BaCl2

Ba2+ + CO3^2- ----> BaCO3 (white ppt)

confirms presence of CO3^2-

b. SO4^2-

Add BaCl2 solution to the spot,

Ba2+ + SO4^2- ---> BaSO4 (white ppt)

confirms presence of SO4^2-. The ppt does not dissolve on addition of HCl.

c. PO4^3-

Add acdified ammonium molybdate

HPO4^2- + 12MoO4^2- + 23H+ + 3NH4+ ---> (NH4)3PO4.12MoO3 (yellow ppt) + 12H2O

d. SO3^2-

Add BaCl2,

Ba2+ + SO3^2- ---> BaSO3 (white ppt)

confirms presence of SO3^2-. The ppt dissolves on addition of HCl.

e. SCN-

Add acidified FeCl3

Fe3+ + SCN- ---> [Fe(SCN)]2+ (blood red ppt)

f. Cl-

Add a drop of acidified AgNO3

Ag+ + Cl- ---> AgCl (white ppt)

confirms presence of Cl-

g. NO3-

Add base and Al,

8Al + 3NO3- + 5OH- ---> 3NH3 + 8AlO2-

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