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

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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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