You know it is reactive by one of the following:
1. A gas is formed
2. A solid (insoluble in solvent) is formed.
3. A weak electrolyte is formed.
These are aqueous solutions so 1 is out.
All of these are strong electrolytes so 3 is out.
For 2 you need to know the solubility tables. ZnCrO4 is insoluble so you know a reaction takes place.
For balancing, you must first use the right formula for the materials present or formed.
ZnCl2 + Na2CrO4 ==> ZnCrO4 + 2NaCl.
Note that NaCl2 is not the right formula for sodium chloride and NaCrO4 is not the right formula for sodium chromate.
what is the balanced equation for aqueous zinc chloride and aqueous sodium chromate?
Is it, ZnCl2+NaCrO4-->ZnCrO4+NaCl2
and how do I know if it is reactive or not?
1 answer
1 answer