About limewater test


by abcd8989
Tags: limewater, test
abcd8989
abcd8989 is offline
#1
Apr27-10, 08:43 AM
P: 43
Carbon dioxide and sulphur dioxide both can turn limewater milky. Either the presence of carbon dioxide and sulphur dioxide can give a positive test result. Why limewater test can be a dedicated test for carbon dioxide?
Phys.Org News Partner Chemistry news on Phys.org
Mantis shrimp stronger than airplanes
MRI sensor that enables long-term monitoring of oxygen levels could aid cancer diagnosis, treatment
The anti-inflammatory factory
alxm
alxm is offline
#2
Apr27-10, 03:56 PM
Sci Advisor
P: 1,867
Quote Quote by abcd8989 View Post
Why limewater test can be a dedicated test for carbon dioxide?
It isn't. (But if you pass SO2 through it long enough, it will form CaS and become clear again, so in this particular case, it can be a test if you have enough gas.)
abcd8989
abcd8989 is offline
#3
Apr27-10, 10:07 PM
P: 43
Quote Quote by alxm View Post
It isn't. (But if you pass SO2 through it long enough, it will form CaS and become clear again, so in this particular case, it can be a test if you have enough gas.)
If excess amount of carbon dioxide is bubbled into limewater, a clear solution can also be formed (calcium hydrogencarbonate formed). So, excess gas also cannot distinguish between sulphur dioxide and carbon dioxide. I wonder why we usually conclude that carbon dioxide is present if a positive result is shown in limewater test, ignore that it is the presence of sulphur dioxide leading to the positive result.

chemisttree
chemisttree is offline
#4
Apr29-10, 03:53 PM
Sci Advisor
HW Helper
PF Gold
chemisttree's Avatar
P: 3,725

About limewater test


Quote Quote by abcd8989 View Post
If excess amount of carbon dioxide is bubbled into limewater, a clear solution can also be formed (calcium hydrogencarbonate formed).
Not true. You will never make a bicarbonate of calcium. It just doesn't happen. ... as a solid anyway.


Register to reply

Related Discussions
Problem 51 from (GRE) math subject test: practice test book Calculus & Beyond Homework 10
Why use mann-whitney U test rather than independent sample test? Other Science Learning Materials 0
stat test to test for dependents of continous variables. Set Theory, Logic, Probability, Statistics 1
Integral test, basic comparsion test, limit comparsion test Calculus & Beyond Homework 11
A primality test for Fermat numbers faster than Pépin's test ? Linear & Abstract Algebra 2