Go Back   Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum

High School Chemistry Forum Ask your high school chemistry questions here.

Reply
 
Thread Tools Display Modes
Old Dec 14th 2016, 10:10 AM   #1
ale8991
Junior Member
 
Join Date: Dec 2016
Location: Netherlands
Posts: 1
ale8991 is on a distinguished road
Freezing point depression of ZnCl2

Hello,
I did an experiment on how different concentrations of ZnCl2 affect the freezing point of demi water. My results were that till a concentration of about 10 mol dm-3 the freezing point decreased (more or less in a linear manner). After that at concentrations of 15mol dm-3 the freezing point started to increase again (approach 0 degrees Celsius again).

Attached in the file is a graph of the freezing point depression vs. the concentration of ZnCl2 in demi water.
X-axis: concentration of ZnCl2 in mol dm-3
Y-axis: freezing point depression in Kelvin

Does anybody know why the freezing point depression initially decreases, and then past a certain concentration increases again?

Thanks in advance!

Ale1998
Attached Images
File Type: jpg ZnCl2 Freezing point depresion.JPG (39.5 KB, 2 views)
ale8991 is offline   Reply With Quote
Old Dec 19th 2016, 10:48 PM   #2
GDforeverlove
Junior Member
 
GDforeverlove's Avatar
 
Join Date: Oct 2016
Location: China
Posts: 7
GDforeverlove is on a distinguished road
why there is still no answer to this question?
GDforeverlove is offline   Reply With Quote
Old Jan 16th 2017, 06:29 AM   #3
Maryna22
Junior Member
 
Join Date: Jan 2017
Location: New york
Posts: 5
Maryna22 is on a distinguished road
Do you still need the answer?
Maryna22 is offline   Reply With Quote
Reply

  Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum

Tags
chemistry, concentration, freezing point depression, zinc chloride, zncl2



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed