Analytical ChemistryHard
Question
In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :
Options
A.decrease concentration of OH- ions
B.prevent interference by phosphate ions
C.increase concentration of Cl- ions
D.increase concentration of NH4+ ions
Solution
Group 3rd radicals are precipitated as hydroxides and the addition of NH4Cl suppresses the ionisation of NH4OH so that only the group 3 cations are precipitated as hydroxides because of their low solubility products.
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
A metal nitrate solution does not give white precipitate with concentrated hydrochloric acid but on dilution with water ...Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ?...Which onr amongst the following pairs of ions cannot be separated by H2S in dilute HCL ?...Which of the following hydrogen halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)?...Which of the following will not give positive chromyl chloride test ?...