How do you balance Co(OH)3 + HNO3-->Co(NO3)3+ H2O?
This is effectively an acid base reaction of the sort:
or more simply,
How did I balance it? Well I know that for every species (every atom) on the LHS must correspond to a species on the RHS. And not only must the atoms balance, the electrical charge must balance. Given the 3 equations, are these conditions fulfilled here?
1 Cobalt on either side so that is fine.
1 Nitrate on the left, 3 on the right so
3 Oxygen on the left (not including the nitrate) , 1 on the right so
Check hydrogen: 6 on the left and 6 on the right so it's all fine.
Tip: make sure you check that there are an equal number of each element on either side