Learning 2B Labs Inc.
Q.A. Dept
Neutral Office
Healthyville, FL
Dear Young Scientist Interns,
Thank you very much for your help in selecting a purification system. Since receiving
your letter the community has instituted a flat tax, per gallon on all residential water use. The tax
is aimed at generating revenue to help restore local woodland areas and parks. Also, I have
discovered an additional purification system to consider. Please include this new information
when ranking researched systems.
In addition, I have included several liquids for your team to test. Each liquid was filtered
using one of the systems researched. Please test each item’s pH and compare results to known
values. I will compare your results to my own to determine the effectiveness of each system.
Please remember, tested liquids can either be neutral, an acid, or a base. A pH of 7 is
neutral, a pH of 1-6 is acidic, and a pH of 8-14 is basic or alkaline. Liquids that are very acidic
(pH of 1-2) or very alkaline (pH of 13-14) are dangerous and can burn you.
Please write a letter in response including: a list of your pH measurements, a rank of
purification systems and a detailed description of the method you used to rank them. If the
method you previously used changed, please explain how it changed and why a change was
necessary. If your method remained the same, please explain why no change was necessary.
Thank you for your participation in this project.
Sincerely,
Indi Pink, PhD