Featured in PASCO’s College Chemistry Instructor Guide

College Chemistry Instructor Guide

(PS-3803A)

College Instructor edition with 36 experiments covering introductory and general chemistry topics.

Analysis of Cations

Lab Summary

Use chemical reactions and chemical properties to identify the cations present in a mixture by systematically reacting the unknown with various reagents.

Theory

Students use chemical properties to qualitatively classify and identify the cations present in a solution.

Method

Students gain experience conducting the following procedures:

  • Organizing and tracking the results of multiple reactions.
  • Performing basic laboratory separation processes.

Materials Used:

Test tube, 10-mL - 10
Test tube rack
Pipet, graduated, 10-mL
Pipet bulb
Pipet, plastic, 1-mL - 7
Centrifuge
Beaker, 250-mL
Evaporating dish
Stirring rod
Hot plate
Litmus paper - 10 
pH paper - 1 roll
6 M Sodium hydroxide (NaOH) - 20 mL
6 M Ammonia (NH3) - 20 mL
0.1 M Potassium chromate (K2CrO4) - 20 mL
1% Aluminon dye- 2 mL
6 M Hydrochloric acid (HCl) - 20 mL
Dimethylglyoxime (DMG) reagent - 5 drops
0.2 M Potassium ferrocyanide (K4[Fe(CN)6]) - 2 mL
3 M Sulfuric acid (H2SO4) - 3 mL
3 % Hydrogen peroxide (H2O2) - 2 mL
Unknown cation solution (use AlCl3, NiCl3, Pb(NO3)2, AgNO3, MnSO4, (NH4)2Fe(SO4)2) - 20 mL
Deionized water - 5 mL
Marking pen

The Associated Bundle:

Advanced Chemistry Standard Sensor Bundle

(PS-2928A)

Contains the probeware for completing experiments in the College Chemistry lab manual.

Interface Required

This experiment may require software and an interface for data collection.