Complete the following reaction and balance it.
a) $C u_{(s)} + H N O_{3 (d i l . a q)} \to$
b) $I_{2 (s)} + H N O_{3 (l)} \to$

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Solution

a) $3 C u + 8 H N O_{3} \to 3 C u (N O_{3})_{2} + 2 N O + 4 H_{2} O$
b) $30 H N O_{3} + 5 I_{2} \to 10 H I O_{3} + 30 N O_{2} + H_{2} O$

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K C l + H_{2} S O_{4} (c o n c .) \to

C u + H C l (d i l .) \to

C u O + H C l (d i l .) \to

C u O + [O] H C l (c o n c .) \to

\overset{}{\to}

I_{2} (s) + O {C l}^{-} (a q) ⟶ {I O}_{3}^{-} (a q) + {C l}^{-} (a q)

S^{2 -} (a q) + I_{2} (s) ⟶ {S O}_{4}^{2 -} (a q) + I^{-} (a q)

C u + d i l . H {N O}_{3} ⟶ N O

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