How do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
Use the proton balance method given below to obtain:
One way to do it is to think of it as a proton donation (acid) reaction and a proton acceptance (base) reaction:
The acid gives one mole of protons but tge base takes two. To balance the protons take two moles of the acid to one of the base:
Then add them up. The protons cancel and the remaining ions combine to make the salt: