The equation is CuCl2 + Na2S ------> 2NaCl + CuS because Na is ahead of Cu in the electrochemical series.
What is a balanced reaction equation?
A balanced reaction equation is one in which the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side.
In this case, the balanced reaction equation is;
CuCl2 + Na2S ------> 2NaCl + CuS. The reaction occur thus because Na is ahead of Cu in the electrochemical series and must always displace it from its aqueous solution.
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