Question

How do you balance `NaCN + CuCO_3 -> Na_2CO_3 + Cu(CN)_2`?

Answer 1

`2NaC-=N(aq) + CuCO_3(s) rarr Na_2CO_3(aq) + Cu(C-=N)_2(aq)`

Explanation:

Is the equation above stoichiometrically balanced? Does garbage in equal garbage out? Cyanide treatment of `Cu^(2+)` can lead to reduction, however, given the context of the question, I think the metathesis (partner exchange) reaction is implied.