# Chem.

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Cu + AgNO3 ---> Ag + Cu(NO3)2 Why is there a two after NO3? Thanks.

• Chem. -

The valence of Cu is +2. The valence of the nitrate ion (NO3^-) is -1. For the compound to be zero, the Cu is +2, two nitrates give -2 (at -1 each), +2 and -2 = 0. Thus, one needs two nitrates to equal the charge on one Cu.

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