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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: kego on January 30, 2010, 06:31:04 pm

Title: Overall Equations
Post by: kego on January 30, 2010, 06:31:04 pm
When given a worded question like:

Quote
For each of the following reactions write an overall equation.

a   lead hydrogen carbonate and sulfuric acid

b   sodium sulfite and nitric acid

c   iron(III) hydroxide and hydrochloric acid

d   calcium carbonate and nitric acid

What's the technique used to find what reactants?

For example, question B.
sodium sulfite and nitric acid --> ?
Na2SO3 + HNO3 --> ?
Title: Re: Overall Equations
Post by: Edmund on January 30, 2010, 06:34:43 pm


Just use the solubility table to determine which is the precipitate
Title: Re: Overall Equations
Post by: cindyy on January 30, 2010, 11:07:35 pm
acid + metal --> salt + H2

acid + metal carbonate --> salt + CO2 + H2O

acid + metal hydrogen carbonate --> salt + CO2 + H2O

acid + metal hydroxide --> salt + H2O

acid + oxide --> salt + H2O

acid + sulfite --> salt + SO2 + H2O

do you mean that ?
Title: Re: Overall Equations
Post by: Edmund on January 30, 2010, 11:29:13 pm
It should look something like this:

(http://castlelearning.com/review/reference/chem%20table%20f.gif)
Title: Re: Overall Equations
Post by: Studyinghard on January 30, 2010, 11:39:10 pm
Quote from: cindyy on January 30, 2010, 11:07:35 pm
acid + metal --> salt + H2

acid + metal carbonate --> salt + CO2 + H2O

acid + metal hydrogen carbonate --> salt + CO2 + H2O

acid + metal hydroxide --> salt + H2O

acid + oxide --> salt + H2O

acid + sulfite --> salt + SO2 + H2O

do you mean that ?

those r acid n base reasctions
Title: Re: Overall Equations
Post by: vexx on January 31, 2010, 12:18:13 am
Quote from: cindyy on January 30, 2010, 11:07:35 pm
acid + metal --> salt + H2

acid + metal carbonate --> salt + CO2 + H2O

acid + metal hydrogen carbonate --> salt + CO2 + H2O

acid + metal hydroxide --> salt + H2O

acid + oxide --> salt + H2O

acid + sulfite --> salt + SO2 + H2O

do you mean that ?

Yeah they are acid-base reactions.

A precipitate is an insoluble substance formed as a result of a reaction.
The solubility table can be used to determine which substances are dissolved and which aren't.
Title: Re: Overall Equations
Post by: cindyy on January 31, 2010, 10:39:36 am
but wait ... why would you need the solubility table when the question is asking for overall equations :S I am so lost ... lol
Title: Re: Overall Equations
Post by: Studyinghard on January 31, 2010, 10:47:29 am
When you mix one reactant and another, eg:    iron(III) hydroxide and hydrochloric acid

you get products. To see if those products will make solids(precipitates) or become aqueous you need to look at the solubility table. 

I posted an explanation on another thread.
http://vcenotes.com/forum/index.php/topic,22670.msg229800.html#msg229800

see if it helps :)
Title: Re: Overall Equations
Post by: cindyy on January 31, 2010, 01:24:58 pm
oh yeah i know that .. its just i didnt think that was what kego was asking thats all ! Lol