When aqueous iron(III) chloride is mixed with aqueous sodium hydroxide

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

When aqueous iron(III) chloride is mixed with aqueous sodium hydroxide, an insoluble iron(III) hydroxide precipitate forms according to

\text{FeCl}_3(aq) + 3\,\text{NaOH}(aq) \rightarrow \text{Fe(OH)}_3(s) + 3\,\text{NaCl}(aq)

A chemist combines 75.0 mL of 0.250 M

\text{FeCl}_3

with 125.0 mL of 0.200 M

\text{NaOH}

. Assume volumes are additive and the precipitate is completely removed from the mixture. (a) Calculate the initial moles of

\text{Fe}^{3+}

and

\text{OH}^-

ions present before the reaction occurs. (b) Determine the limiting reactant and justify your choice with appropriate stoichiometric calculations. (c) Compute the mass, in grams, of

\text{Fe(OH)}_3

that precipitates. (d) After the precipitate is filtered off, calculate the molarity of each ion that remains in the clear filtrate.

Related theory

Browse the problem library