Please help with chemistry question!!

[Clo16]

Hi, I've been set a whole load of homework of which I absolument null. I'm allowing myself to ask for help on this one question because I don't have a clue, have been searching online for aaages and can't find the answer. If I don't ask then I'll end up giving up and failing GCSE chemistry. I really need help, my passing is in your hands!!!

 

There are four main methods of making salts:

A Acid + metal

B Acid + insoluble base

C Acid + alkali

D Solution of salt A + solution of salt B

 

a. A student wanted to make some sodium sulfate.

 

i. which method would be the best one to use?

ii. why?

iii. name the reactants you would use.

iv. write a word equation for the reaction.

 

b. Another student wanted to make some magnesium carbonate

 

i. which method would you use for this salt?

ii. why?

iii. name the reactants you would use

iv. write a word equation for the reaction.

 

Please help!!!!! I've got latin to do next :S

 

xx

[Genecks]

Look at the Periodic Chart. Now, look at it again really, really good.

 

Think about it.

Think about it as though you are in a lab.

 

And, although I don't want to be all E&W on you, research these things.

http://en.wikipedia.org/wiki/Sodium_sulfate

 

What is carbonate?

[John Cuthber]

OK there are 4 choices on offer

Acid + metal

What acid and metal would it take?

Well if you don't realise it would be sulphuric acid and sodium then I don't think you are cut out for chemistry or you haven't been taught much.

Do you know anything about sodium metal?

Now, if you want to try that with sulphuric acid you are a braver man than me.

 

OK, what's next

B Acid + insoluble base

 

Did anyone tell you about solubillities of things?

Here's a more complete table than you usually get in school but it wiill do the job.

http://www.chemos.co.uk/Solubility.htm

You could only use "B" if there were an insoluble base with sodium in it. Let me know if you find one.

 

D Solution of salt A + solution of salt B

This is generally most usefull when the salt you want is insoluble and falls out of solution when you mix the wto solutions. Have another look at that table of solubilities.

 

C Acid + alkali

Looks like it's the only one left.

Now see if you can do something similar for the second compound, magnesium carbonate.

[thedarkshade]

a. A student wanted to make some sodium sulfate.

That'd be [ce]H2SO4 + 2NaOH -> Na2SO4 + 2H2O[/ce]. This is because the neutralization reaction: acid + base = salt + water

 

b. Another student wanted to make some magnesium carbonate

[ce]Mg(OH)2 + H2CO3 -> MgCO3 + 2H2O[/ce] the reason is the same as the first reaction.

[insane_alien]

darkshade, please follow the rules about relpying to homework related threads.

 

DONOT JSUT GIVE OUT THE ANSWER.

[thedarkshade]

This is not the homework section and if I really needed a quick answer and didn't get one I'd be pissed off. I got bad experience from 'trying to get you to the answer', it's you either tell the answer or stop trying to be the smart guy which tries to lead you to the answer.

[Cap'n Refsmmat]

It doesn't really matter which section it's in. It's still homework help, and the rules are the rules, regardless of what you personally think.

 

I'll move the thread.

[imp]

As time is used to argue and apply the "policies", so goes the world around us.

 

imp

[midsize D]

why not just buy some from the store??

 

im just playing but I think that you should use the periodic table and then apply the carbonates with the chemical acids to with some H20 then you will get the soultion

[John Cuthber]

midsizeD,

WTF help is periodic table? Oh, and what does "apply the carbonates with the chemical acids to with some H20 then you will get the soultion" mean?

 

Thedarkside,

I presume you just buy a bottle of H2CO3 then?

Funny, but I don't remember seing it in any of the catalogues.