Select the properly written and balanced equation for the following chemical reaction: aqueous solutions of sodium hydroxide and iron (iii) nitrate react to produce a precipitate of iron (iii) hydroxide in an aqueous solution of sodium nitrate. 3naoh (aq) + fe(no3)3 (aq) arrow fe(oh)3 (s) + 3nano3 (aq) naoh (aq) + feno3 (aq) arrow feoh (s) + nano3 (aq) naoh (aq) + fe(no3)3 (aq) arrow feoh3 (s) + nano3 (aq) 3naoh (aq) + feno3 (aq) arrow feoh (s) + 3nano3 (aq)

First, understand the reactants and products.
Aqueous solution of sodium hydroxide + aqueous solution of iron (III) nitrate -->solid precipitate of iron (III) hydroxide + aqueous solution of sodium nitrate

Change the reaction into symbols.
NaOH (aq) + Fe(NO3)3 (aq) --> Fe(OH)3 (s) + NaNO3

Balance the equation such that the number of reactants and number of products are in equilibrium.
3 NaOH (aq) + Fe(NO3)3 (aq) --> Fe(OH)3 (s) + 3 NaNO3

Thus, the first reaction is the final balanced reaction.

3NaOH(aq) +  Fe(NO3)3 (aq) → Fe(OH)3 (s) +  3NaNO3(aq)

Variables,control,conclusion and finally scientific theory