Web Activities
UNIT 4: CHEMICAL SYSTEMS AND EQUILIBRIUM
Unit 4– Performance Task and Review
p. 635
Analysis
d. Research to find the reaction mechanism and ratios of entities
in EDTA’s reaction with calcium.
k. What are some commercial and pharmaceutical uses for EDTA? Name three
products you can purchase at a grocery store or pharmacy that contain
EDTA and explain why EDTA is added to the product.
l. Is EDTA safe? Describe safety considerations associated with the
use of EDTA as a laboratory reagent and as a consumable product.
MSDS:
EDTA Disodium Salt
This page contains a Material Safety Data Sheet (MSDS) for the disodium
salt of EDTA. This document is useful when considering the safe use
of EDTA in the lab.
Oral
EDTA, Lead & More
This site is a summary of the many pharmaceutical uses of EDTA.
Unit 4 Review
p. 644
Question 56
Liquid carbon dioxide may soon replace the organic solvents
currently being used in dry cleaning. Liquid carbon dioxide is just
as effective in dissolving grease and far more environmentally friendly.
To prevent liquid carbon dioxide from evaporating, the washing machines
must be pressurized to a minimum of 517.6 kPa at 56.6°C.
(a) Use Le Chatelier’s principle and the following
equilibrium to explain why high pressure is required to keep carbon
dioxide in the liquid state.
CO2(g) [eqm. symbol] CO2(l) + heat
(b) High levels of carbon dioxide can be dangerous. What safety precautions
should be observed in the building where the dry cleaning is done?
(c) Conduct library or Internet research to determine the advantages
of using liquid carbon dioxide as a dry-cleaning solvent.
Dry-Cleaning
with Liquid Carbon Dioxide
This site provides detailed information on the use of liquid carbon
dioxide as a dry cleaning solvent, including how it works, its advantages,
and its cost benefits.
What
is CO2? An Ideal Solvent
This site, operated by dry cleaning equipment manufacturer, also describes
the benefits of liquid carbon dioxide as a dry cleaning solvent.
