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Chemistry
Chemistry
Problem
Before adding the reagents of group III, the solution is heated with some concentrated
HNO
3
\text{HNO}_3
HNO
3
in order to: a. oxidise
Fe
2
+
\text{Fe}^{2+}
Fe
2
+
to
Fe
3
+
\text{Fe}^{3+}
Fe
3
+
b. oxidise
Cr
3
+
\text{Cr}^{3+}
Cr
3
+
to
Cr
2
O
7
2
−
\text{Cr}_2\text{O}_7^{2-}
Cr
2
O
7
2
−
c. lower than pH d. increase the
NO
3
−
\text{NO}_3^-
NO
3
−
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