Specification Point 3.15:
Practical: Investigate the effect of changing the surface area of marble chips and of changing the concentration of hydrochloric acid on the rate of reaction between marble chips and dilute hydrochloric acid

Effect of Surface Area and Concentration on the Rate of Reaction

Surface area on the rate of reaction, CIE IGCSE Chemistry

The process of downwards displacement to investigate the effect of surface area and concentration on the rate of reaction

Changing factors (Independent variables):

Surface area: add different sizes of marble chips (solid, crushed and powder )

Concentration: add different concentrations of Hydrochloric Acid

Method:

  • Add Hydrochloric Acid into a conical flask
  • Use a capillary tube to connect this flask to a measuring cylinder upside down in a bucket of water (downwards displacement)
  • Add marble chips into the conical flask and close the bung
  • Measure the volume of gas produced in a fixed time using the measuring cylinder
  • Repeat with different sizes of marble chips / concentrations of Hydrochloric Acid

Result:

    surface area

  • Increase in the surface area of the marble chip, the rate of reaction will increase
  • This is because more surface area particles of the marble chips will be exposed to the dilute hydrochloric acid so there will be more frequent and successful collisions, increasing the rate of reaction

    concentration

  • Increase in the concentration of hydrochloric acid, the rate of reaction will increase
  • This is because there are more particles of hydrochloric acid per volume so there will be more frequent and successful collisions, increasing the rate of reaction

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Author: Jamie

Jamie got a First class degree in Chemistry from Oxford University before going on to teach chemistry full time as a professional tutor. He’s put together these handy revision notes to match the Edexcel IGCSE Chemistry specification so you can learn exactly what you need to know for your exams.