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Standard XII
Chemistry
Electronic Configuration of d-Block Elements
valency of py...
Question
valency of pyrophosphate in Ca2P2O7 i
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Q.
0.5
g of an organic substance containing phosphorus was heated with conc.
H
N
O
3
in the carius tube. The phosphoric acid thus, formed was precipitated with magnesia mixture,
(
M
g
N
H
4
P
O
4
)
which on ignition gave a residue of
1.0
g of magnesium pyrophosphate,
(
M
g
2
P
2
O
7
)
. The percentage of phosphorous in the organic compound is:
Q.
In a gravimetric determination of P, an aqueous solution of
N
a
H
2
P
O
4
is treated with a mixture of ammonium and magnesium ions to precipitate magnesium ammonium phosphate
M
g
(
N
H
4
)
P
O
4
.6
H
2
O
. This is heated and decomposed to magnesium pyrophosphate,
M
g
2
P
2
O
7
which is weighed. A solution of
N
a
H
2
P
O
4
yielded 0.222 g of
M
g
2
P
2
O
7
. What weight of
N
a
H
2
P
O
4
is present originally?
(Atomic mass:
N
a
=
23
u
,
M
g
=
24
u
,
P
=
31
u
,
N
=
14
u
,
O
=
16
u
,
H
=
1
u
)
Q.
In a gravimetric determination of P, an aqueous solution of
N
a
H
2
P
O
4
is treated with a mixture of ammonium and magnesium ions to precipitate magnesium ammonium phosphate
M
g
(
N
H
4
)
P
O
4
.6
H
2
O
. This is heated and decomposed to magnesium pyrophosphate,
M
g
2
P
2
O
7
which is weighed. A solution of
N
a
H
2
P
O
4
yielded 0.222 g of
M
g
2
P
2
O
7
. What weight of
N
a
H
2
P
O
4
is present originally?
(Atomic mass:
N
a
=
23
u
,
M
g
=
24
u
,
P
=
31
u
,
N
=
14
u
,
O
=
16
u
,
H
=
1
u
)
Q.
Chemical formula for calcium pyrophosphate is
The formula for ferric pyrophosphate will be
Q.
Sodium pyrophosphate has the chemical formula
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The formula for ferric pyrophosphate will be
