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Investigating the Rate of Reaction Between Marble Chips and the Varying Concentrations of Hydrochloric Acid

Satisfactory Essays
Investigating the Rate of Reaction Between Marble Chips and the Varying Concentrations of Hydrochloric Acid

Planning

Before starting the experiment I had to work out how much marble chips

would be needed and how much HCl would be needed. I decided that 20

grams of marble chips would be needed and I measured this on a pan

balance. The chips would have to be of medium size as from a previous

experiment done in class I realize that changing the surface area of

the marble chips would change the rate of reaction. I then used 100 cm3

of HCl and this would be the only variable that I will change.

I decided to use the concentrations of 0.5M, 1.0M, 1.5M and 2.0M

(1mole/dm). To make these different concentrations I added different

proportions of distilled water to the 2 molar HCl. For the 2M solution

I left the HCl alone, for the 1.5M solution I put 75 cm3 of HCl and 25

cm3

of distilled water. For the 1M solution I added 50 cm3 of HCl and 50

cm3 of distilled water, for the 0.5M solution I added 25 cm3 of HCl

and 75 cm3 of distilled water.

I then measured to see how long it would take to gain 100 cm3 of CO2

using a stopwatch and a gas syringe. To make sure the gas syringe is

working properly I must make sure that the clam is not on too tight or

it will affect the outcome of the results. To obtain the most reliable

results I will do each experiment three times.

[IMAGE]I predict that the high molarity concentration solution will

have a much faster rate of reaction than the weaker solution. I have

predicted this from my knowledge of a previous experiment and

scientific knowledge. The previous experiment I did was adding Sodium

Thiosulphate to Hydrochloric Acid Sodium Chloride + Sulfur Dioxide +

Sulfur + Water. We were going to see how long it takes to produce

enough sulfur to obscure a black cross under a beaker when we looked
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