This is a simulated experiment on qualitative analysis of the Group I cations. User may select solutions containing known cations, unknown cations as a trial experiment, or unknown cations as an assigned experiment. The results are graded in the trial mode but not in the assigned unknown mode. In the assigned mode, the experiment may be performed, the results printed out and submitted to the instructor. Instructors may contact the author regarding the key for unknowns.
Type of Material:
This item is an interactive simulation.
Recommended Uses:
1. This material may be used as a demonstration in a lecture. 2. It may be used as a pre-lab assignment. 3. It may be used as a post-lab quiz. 4. It could also be used as a short quantitative analysis lab in lieu of a wet chemistry lab.
Technical Requirements:
Standard computer platform using Netscape 4.7+ Explorer 5.0+ with Java Plug-in.
Identify Major Learning Goals:
1. To learn how to carry out a qualitative analysis of group I cations 2. To learn to do a selective precipitation and separation technique 3. To learn to follow a flow chart and develop and write a flow chart for qualitative analysis
Target Student Population:
The target student populations are either high school or college introductory chemistry students.
Prerequisite Knowledge or Skills:
Introductory knowledge of chemical reactions,solubility and precipitation, and complex ion formation. Knowledge of inorganic nomenclature and equation writing is required in order to understand the reactions.
Content Quality
Rating:
Strengths:
This is an excellent learning module- it has been well-designed and implemented to allow the user to learn qualitative analysis of group I cations. It provides details of qualitative analysis of group I cations that are 1. accurate 2. agree with information provided in current textbooks and lab books 3. complete in scope as a simulated experiment 4. provides a cyberlab experience similar to "wet lab" in the laboratory
Concerns:
None
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
This module is very effective at teaching students about qualitative analysis as an experimental technique. It provides the options of working with sets of known solutions and reagents and then the option of working with an unknown solution containing one or more from a list of unknowns. It engages the user to learn through experimentation, and the use of animation and other images. Feedback is provided regarding choice, actions, and experimental procedures via visual feedback.
Concerns:
None
Ease of Use for Both Students and Faculty
Rating:
Strengths:
This learning module presents the information in a very well-designed, easy to use format. The textual explanations and the required actions and choices by the user and the results are well coordinated. The graphics are clear, and convey very well the formation of reaction products as colored precipitates, dissolved ions, etc. The simulation of the experimental techniques of centrifuging, decanting, heating, etc are very good and work without trapping the user. It is easy to navigate and the software is robust.
Concerns:
1) The simulation of centrifugation does not reflect the requirement to properly balance the centrifuge prior to using the apparatus. For safety purposes, this is very emphasized in real laboratory environment. (2) The time duration for the display of the Litmus test could have been longer. Or better,
enable user the option to reset the result of the test.
Other Issues and Comments:
This is an excellent simulation of qualitative analysis of cations of group I.
Creative Commons:
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