Write the exchange reaction in molecular, complete and abbreviated ionic form: FeCl2 + NaOH → Fe (OH) 2 + NaCl.

FeCl2 + 2NaOH → Fe (OH) 2 + 2NaCl Exchange reaction. It goes to the end due to the precipitation of a brown precipitate of iron hydroxide (2).

Fe (+2) + 2Cl (-) + 2Na (+) + 2OH (-) → Fe (OH) 2 + 2Na (+) + 2Cl (-) – Complete ionic equation. Iron hydroxide (2) precipitates, therefore it does not undergo electrolytic dissociation.

Next, we find the same ions on the right and left sides of the equation and cancel them out. What remains is rewritten.

Fe (+2) + 2OH (-) → Fe (OH) 2 – Abbreviated ionic equation.




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