Clo16 Posted April 6, 2008 Share Posted April 6, 2008 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 Link to comment Share on other sites More sharing options...
Genecks Posted April 6, 2008 Share Posted April 6, 2008 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? Link to comment Share on other sites More sharing options...
John Cuthber Posted April 6, 2008 Share Posted April 6, 2008 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. Link to comment Share on other sites More sharing options...
thedarkshade Posted April 6, 2008 Share Posted April 6, 2008 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. Link to comment Share on other sites More sharing options...
insane_alien Posted April 6, 2008 Share Posted April 6, 2008 darkshade, please follow the rules about relpying to homework related threads. DONOT JSUT GIVE OUT THE ANSWER. Link to comment Share on other sites More sharing options...
thedarkshade Posted April 6, 2008 Share Posted April 6, 2008 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. Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted April 6, 2008 Share Posted April 6, 2008 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. Link to comment Share on other sites More sharing options...
imp Posted April 8, 2008 Share Posted April 8, 2008 As time is used to argue and apply the "policies", so goes the world around us. imp Link to comment Share on other sites More sharing options...
midsize D Posted April 9, 2008 Share Posted April 9, 2008 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 Link to comment Share on other sites More sharing options...
John Cuthber Posted April 10, 2008 Share Posted April 10, 2008 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. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now