Experimant 3 - Cation 5 Flashcards
Group V Cations is sometimes called
Soluble Group
Cations 5 include:
sodium, potassium and ammonium ions.
T or F| There is a precipitating agent for the group.
False
It is necessary to test for the ___________ ion upon a portion of the original solution used in the beginning of the analysis.
ammonium
If a strong base such as ___________________ is added to a solution containing ammonium ions and thradoluion)lsfivarmed, he escape of ammonia gas results
KOH or NaOH
The ammonia gas which escapes maybe recognized by its ______ or by its action upon moist _____ litmus paper.
Odor/ red
The most reliable qualitative tests for sodium and potassium ions in low concentrations are identifying their ____________________
flame spectra.
An intense ________________ persisting for several seconds confirms the presence of (sodium ions,
Yellow flame
The presence of potassium ions is indicated by a __________________
Pale violet flame
What are the first 2 cations 5 ate tested?
Sodium and potassium ions
What is the first step in Experiment 3
Add 1 drop of HCL
Dip end of the wire in the _______
Solution of unknown sample and HCL
If yellow flame of sodium is present it will be necessary to view flame through a filter of _____________
Cobalt glass
When viewed through a cobalt glass, ___________________ flame seconds persisting for about 2 seconds confirms presence of POTASSIUM ION.
Reddish- violet
What ion is tested second in experiment 3?
Ammonium ion
