Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Transcript of DeIcer Lab
Jackson, Neal, & Erin
To quantitatively determine the value of the deicer with regard to
Freezing point depression
Enthalpy of dissolution
Cost per unit
Health and Environmental hazards
Finding Freezing Point Depression
Determining Enthalpy of Dissolution
Environment and $$$
Cost per Metric Ton*
Create an ice bath in a large beaker containing water, ice, and rock salt and keep at around -15C
Create 3 solutions each with 20mL of deionized water and either 3.73g (0.05 mol), 0.745g (0.01 mol), and 0.373g (0.005 mol) of KCl creating solution concentrations of 2.5M, 0.5M, and 0.25M respectively.
Measure 3mL of solution and pour it into a test tube.
Place test tube in ice bath.
Using LoggerPro and temperature probe, collect the temperature of the solution and record the temperature at which the solution freezes.
Create calorimeter and determine the calorimeter constant by using a temperature probe to measure the change in temperature of the system when warm water is added to cool water.
Pour 20mL of room temperature DI water into calorimeter and record starting temp.
Add KCl, close the lid, and record the temperature of the system at equilibrium (requires stirring).
Calculate the heat if the solution using:
Seeps into groundwater, can cause release of heavy metals
Salt spray can harm plants up to 50 feet from the road
K can accelerate eutrophication
In small streams, Cl can build up to harmful concentrations
No direct impacts on human health
*1 Metric ton = 1 megagram = 1000 kilograms = 1000000 grams
Entry Level Online
'Food Grade' Price
KCl is a good deicer
It does its job well without too many negative environmental impacts
...but it is more expensive than rock salt
"Chemistry, 7/e Raymond Chang, Williams College Thermochemistry." Online Learning Center. McGraw-Hill Higher Education, 2002. Web. 12 Feb. 2015.