What is the order of the reaction between Mg and HCl??

GorgeousMatt

12

Hi,

what is the order, second order with respect to HCl right??

Cheers
Matt

edit: sorry i meant second

Reply 1

charco

Study Forum Helper

18

why should it be second order? That would suggest a collision involving two H+ ions in the rate determining step.

Reply 2

a¢¢ountant$

im doing this reaction for my chem cw.
i think firstly the hydrogen and the chlorine splits in water to make H+ and Cl-
then
the rate detemining step is I THINK
Mg + 2H+ ---> H2 + Mg2+
each hydrogen takes 1 electron from magnesium, so two hydrogen are needed in the rate determining step so it should be seconed order....
can anyone back this up?

Reply 3

jrrowleyws

D£nti$t

im doing this reaction for my chem cw.
i think firstly the hydrogen and the chlorine splits in water to make H+ and Cl-

Not really a step unless your adding HCl gas to water.

HCl is almost 100% dissociated in water, it has a small pKa. Therefore your looking at ions already in solution before any magnesium is added.

I cant remember the order of the reaction even though I did a similar experiment for my Alevel.

A good website for help is chemistry-react.

Ill PM you some links

Reply 4

charco

Study Forum Helper

18

D£nti$t

im doing this reaction for my chem cw.
i think firstly the hydrogen and the chlorine splits in water to make H+ and Cl-
then
the rate detemining step is I THINK
Mg + 2H+ ---> H2 + Mg2+
each hydrogen takes 1 electron from magnesium, so two hydrogen are needed in the rate determining step so it should be seconed order....
can anyone back this up?

This has a virtually zero percent possibility of being correct as a step, because it is a three particle collision, which is highly improbable.

What is the order of the reaction between Mg and HCl??

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