Practice problems on how to perform dilutions.
Dilution is one part of a larger web page called Biological Assays within Biology Concepts, but it addresses a very fundamental chemical concept that impacts biology in a significant way. It addresses basic volume-concentration dilutions as well as more complex Serial dilutions. Several important laboratory concepts such as making solutions and buffers are also addressed.
Type of Material:
This web site offers text and video animations to deliver the instructional material.
Tutorial on performing dilutions.
Supplementing classroom instruction and independent study.
Out of class or lab practice.
HTML and Quicktime.
Identify Major Learning Goals:
None specifically stated. Site covers:
How to do the calculations to set up the dilution
How to do the dilution optimally
How to calculate the final dilution
Target Student Population:
High school or undergraduate.
Prerequisite Knowledge or Skills:
Some basic understanding of volume and solutions would help, but are not necessary.
Basic biology or chemistry.
Evaluation and Observation
Simple format and well-organized
Conservative use of text helps explain the material without looking like an e-book
Presents a good application of a difficult concept for students
Provides an opportunity to learn theory and perform applications
Content is current and accurate
Limited number of types of dilution problems
Potential Effectiveness as a Teaching Tool
Concepts are distilled down into digestible learning blocks.
Starts with simpler concepts and builds up to more complex concepts
Video animations help keep students attention
Question and quizzes increase the learning experience
Would be a good out of class assignment for students struggling with dilutions
Provides theory, practice problems and answers
Could be used to generate assignments
On my computer the videos were a little small. This could be a strength if the user has a smaller monitor
Problems are somewhat simple--more examples would be useful