Is itr eally neccesary to memorise the precipitation reactions and the processes to.. (1 Viewer)

[sinophile2]

and the processes to identifty ions in solution?

My teacher said yes. I'm a little unsure aobut that reply, because there is quite alot of memorise, as well as it not being directly asked for in the syllabus.

 

[lychnobity]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

and the processes to identifty ions in solution?

My teacher said yes. I'm a little unsure aobut that reply, because there is quite alot of memorise, as well as it not being directly asked for in the syllabus.

yes it is.

In the 3rd section of the cmm topic, one of the bullet points says: "deduce the ions present in a sample from the results of tests"

How are you to deduce if you don't know the tests?

 

[Timothy.Siu]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

yeah, it can be examined, theres dotpoints on this...

 

[sam5]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

i would have thought that it was only important to know what to add to a sample if suspected of certain ions.

e.g. add barium ions to test for sulfates (a white precipitate i think), add hydroxides to test for copper ions if a flame test is inappropriate (u will get a blue precipitate).

 

[jellybelly59]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

yes... i've seen it come up a lot in past hsc exams - esp. the MC

 

[micuzzo]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

^ i think only the main ones are needed... i have never come across an HSC question where u needed to kno the steps in detail... then again i havent done all the hsc papers.

 

[shinigami66]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

do we need to know everything about EDTA and Winkler methods? the methods are so annoying and hard to memorise =[

 

[joben]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

this is talking about the precepititaion reactions for anions and cations-not water testing. But for EDTA and WInkler I don't tink u gotta know it in detail.

 

[Aerath]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

do we need to know everything about EDTA and Winkler methods? the methods are so annoying and hard to memorise =[

You need to know what they are, ie EDTA is a method for hardness, and Winkler is for DO. But aside from that, you don't need to know anything else.

 

[Marina89]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

I know all the precipitation tests but are there any equations I need to memorise?

 

[harry4]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

wtf are EDTA and the winkler thing. we definitely never learnt that. for dissolved oxygen could u do electrolysis and then say the product(not sure what it would be) is proportional to DO

 

[harry4]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

????????

 

[kwabon]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

wtf are EDTA and the winkler thing. we definitely never learnt that. for dissolved oxygen could u do electrolysis and then say the product(not sure what it would be) is proportional to DO

EDTA and winkler method are just ways to test for hardness and dissolved oxygen.

 

[harry4]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

so do i have to know anything about them or just say like

dissolved oxygen can be measured using the winkler method

 

[boxhunter91]

Re: Is itr eally neccesary to memorise the precipitation reactions and the processes

All we hope is for a M.C on this and not a 5 marker..