Question

How do we represent the reaction between `"nickel(II) chloride"` and `"sodium hydroxide"` stoichiometrically?

Answer 1

I think you have already done it, mate.

Explanation:

You gots......

`NiCl_2(aq) +2NaOH(aq) rarr Ni(OH)_2(s)darr + 2NaCl`

All chemical equation CONSERVE (i) mass; and (ii) charge, and this is the principle of stoichiometry.......`"garbage in equals garbage out."` The same principle is observed in accounting, and even in getting the right change from a £20-00 note when you go to the shop.....for every debit there must a corresponding credit.

In your given reaction, for every reactant particle, there is a corresponding product; charge is likewise conserved. And you have thus observed these principles.

The physical states of the reactants and products are something that you have to verify experimentally, but as written the equation is stoichiometrically balanced and sound.