A student writes the following net ionic equation for the reaction between aqueous…

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

A student writes the following net ionic equation for the reaction between aqueous iron(III) chloride and aqueous sodium hydroxide: Fe3+(aq)+2 OH−(aq)→Fe(OH)2(s)\text{Fe}^{3+}(aq) + 2\,\text{OH}^-(aq) \rightarrow \text{Fe(OH)}_2(s) The equation above does not satisfy both mass and charge conservation. Which of the following single modifications would correct the equation so that both laws are satisfied? (a) Change the charge on iron from 3+3^+ to 2+2^+ (b) Change the coefficient of OH−\text{OH}^- to 3 and the product to Fe(OH)3(s)\text{Fe(OH)}_3(s) (c) Add Na+(aq)\text{Na}^+(aq) on both sides of the equation (d) Double every coefficient in the equation

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