Register to reply

Test for chlorides and sulfates

by dioprem
Tags: chlorides, sulfates, test
Share this thread:
dioprem
#1
Dec31-09, 12:39 AM
P: 11
Hi guys needed to check up on something. Recently in school we were taught that in order to test for the presence of chloride ions, we had to add acidified silver nitrate to check for the precipitation of silver chloride. Similarly, to test for sulfates, we were told to add acidified barium nitrate to check for the precipitation of barium sulphate.

I am confused by the "acidified" portion. Say I am testing for chlorides. I am supposed to add nitric acid as well as silver nitrate. When I asked why this was so, I was told that it was to eliminate any other potential silver salt from precipitating. So any precipitate I saw would only be silver chloride and not some other silver salt. Thus I would know for sure that chloride ions were present.

How does adding nitric acid eliminate other possibilities?
Phys.Org News Partner Chemistry news on Phys.org
Photosensitive version of amiloride allows regulating the function of sodium-specific ion channels with light
Scientist hopes to improve rare earth purification process
Highly efficient nanoparticles could bring down the cost of fuel cells
Borek
#2
Dec31-09, 04:23 AM
Admin
Borek's Avatar
P: 23,363
Think what other salts are possible, think about strength of the other acids.

--


Register to reply

Related Discussions
Problem 51 from (GRE) math subject test: practice test book Calculus & Beyond Homework 10
Stat test to test for dependents of continous variables. Set Theory, Logic, Probability, Statistics 1
Suggest with reasons, to which group of the Periodic Table element X b Biology, Chemistry & Other Homework 5
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