cation group analysis Flashcards
(28 cards)
DETECTION OF PRESENCE OF ELEMENT IN SAMPLE MATERIAL
cation analysis
CATION ANALYSIS IS ACCOMPLISHED THROUGH __________ REACTION BY ADDING GROUP REAGENTS
precipitation
group 1 cations
hydrocholic acids
group 2 cations
hydrogen sulfide
group 3 cations
ammonium sulfide
group 4 cations
ammonium carbonate
group 5 cations
soluble group
hydrochloric acid is aka
silver group
precipitates with HS2 in dilute mineral acid medium
hydrogen sulfide
precipitates with dilute HCl
hydrochloric acid
is an insoluble solid that emerges from a liquid solution; chemical reaction between liquids
precipitate
form precipitates with ammonium sulfide in neutral or ammoniacal medium
ammonium sulfide
2 subgroups of ammonium sulfide
aluminum subgroup and iron subgroup
a group under ammonium sulfide that is amphoteric hydroxides; insoluble BUT dissolves in excess of sodium hydroxide
aluminum subgroup
insoluble in the excess of the alkali.
iron subgroup
elements under aluminum subroup
Al3+, Zn3+, Cr2+
elements under iron subgroup
Fe2+, Fe3+ Mn2+, Co2+, Ni2+
precipitates with ammonium carbonate in the presence of chloride in a neutral medium
ammonium carbonate
do not react with mentioned reagents
soluble group
elements under hydrochloric acid
Ag, Pb+2, Hg+2
2 subgroups of hydrogen sulfide
copper and tin subgroup
a subgroup under hydrogen sulfide that’s insoluble in sodium sulfide reagents
copper subgroup
a subgroup under hydrogen sulfide that’s soluble in sodium sulfide reagents
tin subgroup
elements under copper subgroup
Pb, Cu, Cd, Bi
