Реферат: Rates Of Reaction Essay Research Paper Rates

Reaction Rate and Concentration.

The reaction rate increases when the concentration of the acid increases

because:

If you increase the concentration of the acid you are introducing more particles

into the reaction which will in turn produce a faster reaction because there

will be more collisions between the particles which is what increases the

reaction rate.

METHOD.

To get the amount of magnesium and the amount of hydrochloric acid to use in

the reaction, we have to use an excess of acid so that all of the magnesium

disappears.

Mg + 2HCl= MgCl2

+ H2

1 mole 2 moles1 mole

1 mole

So, we can say that one mole of magnesium reacts with 2 moles of hydrochloric

acid.

If we use 1 mole of magnesium and 2 moles of hydrochloric acid we will get a

huge amount of gas, too much for us to measure. We would get 24,000 cm3 of

hydrogen produced where we only want 100 cm3 of hydrogen produced. So to get

the formula for the amount of moles that we have to use the formula:

Moles = mass of sample 100=0.004 moles.

volume with 1 mole24,000

To get the maximum mass we can use:

Mass = moles x RAM.

= 0.004 x 24

= 0.0096g

So, this is the maximum amount of magnesium we can use. To the nearest 0.01 of

a gram = 0.01. This is the maximum amount of magnesium we can use.