Phosphoric acid has minimum equivalent weight when 1 mole of it react with
a) 1 mole of NaOH
b) 2mole of NaOH
c) 3mole of NaOH
d) 4 mole of NaOH
Answers
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9
Answer:
When one mole NaOH reacts with H
3
PO
4
then here H
3
PO
4
acts as a monobasic acid
H
3
PO
4
+NaOH→NaH
2
PO
4
+H
2
O
⇒E=
1
m
=m
When two moles NaOH reacts with H
3
PO
4
then H
3
PO
4
acts as diabasic acid
H
3
PO
4
+2NaOH→Na
2
HPO
4
+a−H
2
O
⇒E=
2
m
When three moles NaOH reacts with H
3
PO
4
then H
3
PO
4
acts as a tribasic acid
H
3
PO
4
+3NaOH→Na
3
PO
4
+3H
2
O
⇒E=
3
m
...so when three moles NaOH reacts with H
3
PO
4
, it has minimum equivalent weight.
Hence, the correct option is C
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