Speed Of Reaction Essay

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Recommended: Affect of concentration on rate of reaction

Investigation looking At the Speed of Reactions

Introduction

The aim of this experiment is to find out how a variable can affect the results from a scenario set up in scientific environment. The experiment is to see how a certain variable will affect the amount of
Gas produced from a Calcium Carbonate and Hydrochloric Acid Reaction.

The Science

Calcium Carbonate is a generally white or colourless mineral that is translucent. When compressed or exposed to great heat the mineral binds together in small to large clumps forming calcium Carbonate
Chips, however left in it's formed state it is powder, a chalk like substance. I could use either forms of the Calcium Carbonate for the experiment. Hydrochloric Acid, is a clear, colourless to slightly …show more content…

Word Equation
=============
Calcium carbonate + Hydrochloric Acid ===> Calcium Chloride + Water +
Carbon Dioxide

Symbol Equation
===============
CaCO3 + 2 HCl ---> CaCl2 + H2O + CO2

Prediction

My prediction is that if the concentration of the acid increases there will be an increase in output of Carbon Dioxide from the reaction for example the highest concentration produce the most gas in the given time. I used a preliminary test to help in the prediction. I went and prepared marble chips and concentrated acid we tried the experiment, the results was clear that as in a few seconds it was almost finished.
When we used very dilute acid it took so long for it to react and the amount of bubbles were much less than the first one. By using the results I can make the prediction of that, the rate of reaction is affected by concentration.

Hypothesis

If the concentration of an acid increase than output of gas will also increase. When the acid has a high concentration that means in that solution, compared to a dilute one there are more particles available to react with therefore the amount of times they will collide with the each other is …show more content…

The concentration of the reactants solution
3. Temperature of experiment
4. Amount of time available for reaction
5. Amount of solid reactant
6. Amount of reactant solution

Particle size

The reaction between calcium carbonate and dilute hydrochloric acid is used to prepare CO2. Varying the size of the Calcium Carbonate can make the reaction produce more or less Carbon Dioxide in the time frame available. I could try using either lumps or powder and see which reaction would produce more gas. This would have to be kept the same to ensure that the surface area of the Solid reactant remains the same as a greater surface area produces more gas than a smaller one. I have decided to use marble chips as tests reveal that powder allows to much gas to be produced to obtain an accurate recording.

Concentration

Concentration is a very important factor in rates of reaction. The concentration of a solution can greatly effect a reaction this is because there will be more particles of the reactant to react with, which will increase the time taken for the reaction. If the concentration of an acid is increased, the rate of reaction will increase because the collision rate would be higher and the amount of
CO2 would be given out more quickly. This is why the concentration

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