Acidic Environment Dot Point (1 Viewer)

[braindrainedAsh]

I'm summarizing acidic environment at the moment (yes... should have done it months ago!)

use available evidence to model the molecular nature of acids and simulate the ionisation of strong and weak acids

WTF? We certainly never did this. If anyone could tell me how they modelled this it would be greatly appreciated because I have no idea!!!!

 

[sneaker]

in class we formed groups and made posters to simulate the ionisation of acids like HCl and presented them to the class. In using available evidence we checked the textbook

 

[braindrainedAsh]

Were the posters just diagrams of the molecules, or what?

Thanks for your help... sounds like you get to do more fun stuff than my chem class lol!

If I said that we modelled it using those molecule modelling kits (when you have the sticks and the different sized balls for different chemicals) would that be appropriate? Cause we did that for something in yr 11.

 

[+:: $i[Q]u3 ::+]

our "model" was four different pictures we drew on sheets..
like, you draw lots of molecules dissociating for HCl and only a few dissociating for weak acids. And we also had two other pictures showing concentrated and weak...
1. weak conc
2. strong conc
3. weak dil
4. strong dil.

 

[iambored]

i dnt think we modelled it, but 4 that point i just copied a pic from the text book - pic contained 4 beakers - weak conc, strong conc, weak dil, strong dil

 

[Huy]

Originally posted by +:: $i[Q]u3 ::+
our "model" was four different pictures we drew on sheets..
like, you draw lots of molecules dissociating for HCl and only a few dissociating for weak acids. And we also had two other pictures showing concentrated and weak...
1. weak conc
2. strong conc
3. weak dil
4. strong dil.

yep, we did exactly the same thing.
our "illustrative" model
then we wrote notes on them below (ripping off conquering chem, roland smith)

=========================================

*concentrated and dilute
concentrated and dilute are other terms that are used to describe acid and alkali solution.

a concentrated solution is one in which the total concentration of solute species is high - say above about 5 mol/L.

a dilute solution is one in which the total concentration of solute species is low - say about less than 2 mol/L.

we can therefore have a concentrated solution of a weak acid or a dilute solution of a strong acid. the terms strong and weak, concentrated and dilute, have completely indepdent meanings, as illustrated above (drew 4 beakers with molecules/ions)

1. concentrated solution of strong acid
* heaps of positive and negative ions present in the beaker. just draw --'s and +'s in solution.

2. dilute solution of a strong acid
* a few positive and negative ions present in the beaker, say 1/3 as many ions compared to the concentrated solution.

3. concentrated solution of a weak acid
* about 2 +'s and 2 -- ions in the beaker, with unionised molecules (use a different colour if you'd like). but make sure you draw a heap of them

4. dilute solution of a weak acid.
* only 1 + (positive) ion and 1 -- (negative) ion in solution, with a few unionised molecules in the beaker

============================================

 

[braindrainedAsh]

Thanks so much, that's really helpful!

 

[Toodulu]

yea we just drew them as well. there are also some CD-ROMs at school that we played with.