ChemistryHard64×since 2004Q1782In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :Adecrease concentration of −OH{ }^{-} \mathrm{OH}−OH ionsBincrease concentration of Cl−\mathrm{Cl}^{-}Cl− ionsCprevent interference by phosphate ionsDincrease concentration of NH4+\mathrm{NH}_4{ }^{+}NH4+ ionsCheck answerSkip