[bugsmenot]

im designing an experiment to find the order of reaction in relation to an acid:

2HCl + Mg -----------> MgCl2 + H2


i am doing it by monitoring the rate at which H2 is expelled  and have calculated it such that 0.1 g of Mg will give exactly 100 cm3 of gas.

to find the order of reaction in relation to the acid, do i have to keep the acid concentration constant?

i have tried by keeping it in excess but if the reaction uses 10.4cm3 of acid at a conc of [0.8], does a total volume of 20 cm3 of acid provide a great enough excess?


if not what is the effect of this??


please help as i am very confused

[Gerard]

im designing an experiment to find the order of reaction in relation to an acid:

2HCl + Mg -----------> MgCl2 + H2


i am doing it by monitoring the rate at which H2 is expelled  and have calculated it such that 0.1 g of Mg will give exactly 100 cm3 of gas.

to find the order of reaction in relation to the acid, do i have to keep the acid concentration constant?

i have tried by keeping it in excess but if the reaction uses 10.4cm3 of acid at a conc of [0.8], does a total volume of 20 cm3 of acid provide a great enough excess?


if not what is the effect of this??


please help as i am very confused

try solving you problem mathematically by
dca/dt=k(Cmg)(square of Chcl)