2nd order i would guess. Its definately not zero order thats for sure.
And as Mg2+ requires 2HCl molecules, then doubling the amount of HCl (with infinite amount of Mg present) will increase the reaction 4 times.
I think (it has been some years...
J

Reply 3

Ben.S.

11

foolfarian

2nd order i would guess. Its definately not zero order thats for sure.
And as Mg2+ requires 2HCl molecules, then doubling the amount of HCl (with infinite amount of Mg present) will increase the reaction 4 times.
I think (it has been some years...
J

That's not the way it works - you can't deduce it from the balanced equation. It could be second order, but it probably isn't.

Ben

Reply 4

Blamps

OP

10

Ben.S.

That's not the way it works - you can't deduce it from the balanced equation. It could be second order, but it probably isn't.

Ben

I thought maybe it is 1 order but now I am just more confused lol!

Reply 5

jediknight007

10

Ok, have you carried out the experiment out yet? And what are your vairables? I used concentration/rate for mine. Once you have your results, draw them onto a graph and with the shape of the line/curve, you can tell what order each reactant is. Hope this helps.

Reply 6

elpaw

15

its probably first order:

Mg + HCl -> MgCl+ + H- (slow step)

MgCl+ + HCl -> MgCl2 + H+ (quick)

H+ + H- -> H2 (quick)

== order 1

(i might be wrong. so im probably no help)

Reply 7

Ben.S.

11

It is first order with respect to HCl and zero order with respect to magnesium, so the overall order of reaction is first.

Ben

Reply 8

Blamps

OP

10

Ben.S.

It is first order with respect to HCl and zero order with respect to magnesium, so the overall order of reaction is first.

Ben

Is that a definite answer? Sorry if I am being a pain it's just I am getting a bit worked up about this coursework even though it should be easy but, I am crap at chemistry (but by some miracle got a A at A/S level)

Reply 9

Cathie

Ben.S.

It is first order with respect to HCl and zero order with respect to magnesium, so the overall order of reaction is first.

Ben

Yep, you are right, just had chem and was working c**p like this out....

Reply 10

munkeh

I'm working on a similar coursework due in tomorrow at latest.

The peice is a study of how basicity affects the rate of a reaction, basicity being the number of hydrogen ions that will dissasociate from one molecule of the acid.

In this case, HCl monobasic
H2SO4 dibasic

My data is concentration of H+ ions in solution over time.(this was calculated using amount of H2 gas evolved.

My graphs are so close to zero order, ie no curve it's a joke. Is there any way of calculating partial orders like 1.5 order or 0.9 order.

Could someone also tell me the difference between initial rate and overall rate? Including a method of calculating it would be soooooo helpful.

Thanks in advance

What order of reaction?

Related discussions

Latest

Trending

Trending

Articles for you