ATAR Notes: Forum

HSC Stuff => HSC Science Stuff => HSC Subjects + Help => HSC Chemistry => Topic started by: elizabethbeth on August 25, 2019, 09:38:55 pm

Title: Solubility rules
Post by: elizabethbeth on August 25, 2019, 09:38:55 pm

Using NAGSAG rules for solubility with PMS and Castrobar exceptions, how can you work out if for example whether each of those below are soluble as they aren’t part of the NAGSAG list?

Barium phosphate
Magnesium hydroxide

Thanks for any help

Title: Re: Solubility rules
Post by: fun_jirachi on August 26, 2019, 08:24:18 pm

Welcome to the forums!

Both of those I think are insoluble. I think that unfortunately you actually have to remember exceptions; precipitation tests for ions often help because common precipitates are used for these tests and overlap with common ones mentioned elsewhere. Outside of this, there are other ways to commit the rest of them to memory (ie. more acronyms! or something or other), but unfortunately, I don't have a better method :(

Hope this helps anyway! :)