Salt Analysis Flashcards
Identify cations and anions
What is the observation for the preliminary test of salt color?
White
Indicates the absence of Co2+, Fe2+, Ni2+, and Cu2+.
What color flame is produced by Ca2+ in the flame test?
Brick red flame color
What color flame indicates the presence of Ba2+?
Apple green flame color
What flame color suggests the presence of Sr2+?
Crimson red flame color
What ash colors are observed in the ash test and what do they indicate?
- Blue ash: May be the presence of Al3+
- Green ash: May be the presence of Zn2+
- Pink ash: May be the presence of Mg2+
What does effervescence of a colorless odorless gas turning lime water milky indicate?
CO32- may be present.
What is the result of treating salt with dilute H2SO4 in the indicatory test?
Effervescence indicating CO2 gas, confirming CO32-.
What is the observation when Cl- is present during the test with NH4OH?
Evolution of white fumes with a pungent irritating smell.
What indicates the presence of NO3- during the heating test with Conc. H2SO4?
Evolution of brown fumes.
What smell indicates the presence of CH3COO- during the test?
Vinegar smell.
What is the confirmatory test for SO42-?
Salt solution + Barium Chloride solution produces a white precipitate insoluble in dilute HCl.
What does a curdy white precipitate soluble in NH4OH confirm?
Cl- confirmed.
What reaction confirms the presence of NO3- in the brown ring test?
Brown ring at the junction of two liquids.
What does a reddish brown precipitate in the presence of FeCl3 confirm?
CH3COO- confirmed.
What is the result of the confirmatory test for Al3+ using dil. HCl?
Blue ppt (Lake) floats in clear liquid.
What does a white precipitate in the confirmatory test for Zn2+ indicate?
Zn2+ confirmed.
What indicates the presence of Ca2+ in a confirmatory test?
White precipitate with ammonium oxalate solution.
What is the observation for the confirmatory test of Sr2+?
White precipitate with ammonium sulfate solution.
Fill in the blank: The group reagent for Group 0 is _______.
Na2CO3 solution.
True or False: The presence of Pb2+ can be confirmed by a yellow precipitate with K2CrO4.
True.
What does the presence of black precipitate in the test with H2S indicate?
Presence of Group II ions (Cu2+, Cd2+).
What is the result of the confirmatory test for NH4+?
Smell of ammonia and brown precipitate.
What confirms the presence of Mg2+ in the final group test?
White precipitate with NH4Cl + NH4OH + Na2HPO4.
