An Investigation To Find Out How The Concentration Of Hydrochloric Acid Affects The Rate Of Reaction With Calcium Carbonate

2741 words - 11 pages

An Investigation To Find Out How The Concentration Of Hydrochloric Acid Affects The Rate Of Reaction With Calcium Carbonate

Background Knowledge

I am doing this experiment to find out whether the concentration of
hydrochloric acid affects the rate of reaction with calcium carbonate.
In this experiment, when you add calcium carbonate (marble chips) to
hydrochloric acid, carbon dioxide is given off.

EQUATION

[IMAGE]CaCo₃ + 2HCl CaCl₂ + H₂O +C0₂

[IMAGE]Calcium Carbonate + Hydrochloric acid Calcium Chloride + Water
+ Carbon Dioxide.

[IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]Collision Theory

[IMAGE]

Because I am ...view middle of the document...

Here is a table of my results:

Note: each experiment I have done uses 10ml of hydrochloric acid.

Test 1: 1 molar hydrochloric acid. 0.5 grams marble chips

Time (sec's)

Cm3 of CO2

10

1

20

3

30

4

40

5

50

7

60

9

70

11

80

13

90

15

100

17

Test 2: 1 Molar hydrochloric acid. 1 gram of marble chips

Time (Sec's)

Cm3 of CO2

10

2

20

6

30

10

40

15

50

20

60

25

70

29

80

33

90

37

100

40

Test 3: 2 Molar hydrochloric acid. 0.5 grams of marble chips

Time (Sec's)

Cm3 of CO2

10

1

20

3

30

4

40

7

50

10

60

13

70

17

80

20

90

23

100

27

Test 4: 2 Molar hydrochloric acid. 1-gram marble chips

Time (Sec's)

Cm3 of CO2

10

1

20

3

30

5

40

9

50

12

60

17

70

21

80

25

90

30

100

35

Analysising my preliminary tests and decisions

'The more concentrated the hydrochloric acid, the more collisions that
will take place'. This would mean, the faster the reaction. From my
preliminary tests, I have decided to use 1gram of marble chips and
10ml of hydrochloric acid. I have decided to change the concentration
of the acid (molar) I use. The reason I chose the 2nd experiment as my
actual measurements was because it seemed most accurate and the speed
of the reaction gradually slowed down. This was because the amount of
collisions had decreased amounting to a more steady reaction because
the concentration was getting less. However, the other experiments
didn't seem to show this in the amount of time I tested each
experiment (100 seconds). Maybe, if I'd have used more than a
hundred-second's to carry out each experiment, my results may have
been different.

So, in my actual experiments, I'll be using 5 different concentrations
of hydrochloric acid (in molar). The reason I have chosen 5 different
measurements is because, if I had done 1, I wouldn't have realised
which concentration of hydrochloric acid worked best. By doing 5
experiments, I'll get a more accurate answer at the end.

The 5 different measurements I'll be experimenting on, of hydrochloric
acid are:

I) 1m

II) 1.25m

III) 1.5m

IV) 1.75m and

V) 2m

Molar: the units I'll be measuring in.

My plan

Firstly, I will have to set out the apparatus I'll be using, as shown
on my diagram. Then I'll be accurately measuring the concentration of
hydrochloric acid into a measuring tube and 1gram of marble chips
using the electric scales. [IMAGE]. After pouring...

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