cations Flashcards
Zero Group ammonia
To a little of salt solution add NaOH and heat
Smell of Ammonia forming dense white
fumes with HCl Presence of ammonia
Zero Group ammonia
confirm
To a little of salt solution add Nesslers reagent Brown ppt
lead confirm
To a little of salt solution add potassium chromate solution
Yellow ppt- Lead chromate is formed.
To a little of salt solution add potassium iodide solution
Yellow ppt dissolving in hot and
reappearing as golden spangles. -presence of lead confirmed
Group I(Pb2+)
To a little of salt solution add Dil. HCl White ppt
Group III(Al3+)
To a little of salt solution add NH4Cl and excess
NH4OH White gelatinous ppt
aluminium confirm
To a little of salt solution add NaOH and heat White ppt soluble in excess NaOH Presence of aluminium ion confirmed
Lake test: To a little of salt solution add blue litmus and NaOH Blue ppt Presence of aluminium ion confirmed
Ash test: To a little of salt add con. HNO3 and Cobalt nitrate solution. A filter paper dipped in this solution burn to ashes
*Blue tinted ash * -Presence of aluminium ion confirmed
Group IV(Zn2+)
To a little of salt solution add NH4Cl and excess
NH4OH and H2S is passed through the solution dirty white ppt
zinc confirm
To little of the salt solution add NaOH in drops and in
excess
White ppt formed dissolved in excess
NaOH Presence of Zn confirmed
To a little of the salt solution add potassium
ferrocyanide solution White or bluish white ppt Presence of Zn confirmed
Ash test is conducted green tinted ash Presence of Zn confirmed
Group V(Ba2+, Sr2+, Ca2+)
To a little of salt solution add NH4OH, NH4Cl and
then add ammonium carbonate White ppt Presence of group V cations
Dissolve the above ppt in acetic acid and boiled and divided in to three parts
Test for Ba2+
To the first portion of the solution potassium chromate
solution is added Yellow ppt Presence of Ba2+
Test for Sr2+
To the second portion add ammonium sulphate
solution white ppt presence of Sr2+ confirmed
Test for Ca2+
To the third part add ammonium oxalate solution White ppt Presence of calcium
Flame Test: A little of the salt is made in to a paste
with con. HCl in a watch glass and shown in to the
non-luminous flame Brick red colour Presence of Ca
2+ ion confirmed
Flame Test: A little of the salt is made in to a paste
with con. HCl in a watch glass and shown in to the
non-luminous flame Apple green colour Presence of Barium confirmed
Group VI(Mg2+)
To a little of salt solution add NH4Cl, NH4OH and
disodium hydrogen ortho phosphate solution White ppt Presence Mg2+
To a little of salt solution add magneson reagent Sky blue ppt Presence Mg2+ confirmed
Ash test pink tinted ash Presence Mg2+
