Home > Subjects > Chemistry > Level 2 > 2.1 Qualitative analysis > Subject content
- Subject: Chemistry
- AS: AS90305
- Level: 2
- Credits: 3
- Internal
Chemistry 2.1 Carry out qualitative analysis
Subject content
Your teacher will guide you in following good practice and safety in carrying out your analysis.
This achievement standard involves analytical chemistry where the analysis identifies the components of an ionic solution. The techniques used here involve precipitation reactions and the formation of complex ions to identify the ions.
- Ions that you may be tested on include:
- Ag+, Al3+, Ba2+, Cu2+, Fe2+, Fe3+, Mg2+, Pb2+, Na+, NH4+, Zn2+, Cl-, CO32-, I-, NO3-, OH-, SO42-
- Na+ and NO3- are identified by a process of elimination
- NH4+ will be identified using its reaction with NaOH.
- Complex ions may include FeSCN2+ and those formed when OH-(aq) or NH3(aq) react with the cations that are included in the above lists, such as:
- [Ag(NH3)2]+, [Al(OH)4]–, [Pb(OH)4]2–, [Zn(OH)4]2–, [Zn(NH3)4]2+,[Cu(NH3)4]2+.
Try revisions about precipitation reactions and precipitation theory.
