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To monitor the rate of reaction we measure how a product changes with time, I am going to collect the gas given off when magnesium reacts with different concentrations of hydrochloric acid at a given time.

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Introduction

Chemistry Investigating the rate of reaction by changing the concentration Aim: To monitor the rate of reaction we measure how a product changes with time, I am going to collect the gas given off when magnesium reacts with different concentrations of hydrochloric acid at a given time. I think that by increasing the concentration of the acid we will increase the rate of reaction. In this experiment I am going observe and record the reaction between magnesium and different concentrations of hydrochloric acid I am going to investigate how temperature affects the rate of reaction between magnesium and hydrochloric acid. My question is to see that if I change the concentration of the Hydrochloric acid for each experiment I will see an increase or decrease in the rate of reaction between Hydrochloric acid and Magnesium ribbon. I am intending to react a chosen length of magnesium ribbon with a chosen volume of hydrochloric acid. I will measure the rate of reaction by collecting the hydrogen gas that is produced in a gas syringe that will be connected, via a piece of rubber tubing and a rubber bung to the conical flask that the reaction will take place. I will quickly drop the length of magnesium into the flask and connect the rubber bung to it. I will then start the stop clock and record the volume of gas evolved every 5 seconds for 15 seconds. ...read more.

Middle

I have chosen to investigate temperature, which will be the only variable * Rates of Reaction Increasing the temperature increases the speed of the particles. The faster the particles move, the greater the number of collisions, and therefore the rate of the reaction increases. A 10OC rise in temperature almost doubles the rate of most reactions. Chemical reactions take place by chance. Particles need to collide with enough velocity so that they react. As the temperature is increased the particles move faster since they have more energy. This means that they are colliding more often and more of the collisions have enough velocity to cause a reaction. Since there are more collisions the chemical reaction takes place faster. Depending on certain factors the rate that this reaction will take place will either increase or decrease. The factors that may affect the rate of reaction are as follows: � Temperature of the Hydrochloric Acid � Mass of the magnesium ribbon used � Concentration of the Hydrochloric acid � Surface area of the magnesium ribbon used All of these factors will change the rate of reaction because of the Collision Theory. This is a theory that is used to predict the rate of a reaction. The Collision Theory is based on the idea that for a chemical reaction to take place, it is necessary for the reacting particles to collide with each other with enough energy to break or form new bonds between the other particles, which is called a successful collision. ...read more.

Conclusion

Experiment 1 Concentration of Acid(Moles) Initial Temperature(Degrees) Final * Repeat experiment two more times (for accuracy) and record all results in a table. * Repeat the experiment for temperatures of 30 OC, 40 OC, 50 OC and 60 OC I am going to investigate how temperature affects the rate of reaction between magnesium and hydrochloric acid. The procedure for the experiment is as follows; Method 1. Put on safety goggles 2. Collect clamp stand, clamp and boss 3. Collect conical flask and measuring cylinder 4. Collect stop clock 5. Measure out 15cm3 of 1.0M hydrochloric acid with the measuring cylinder 6. Pour hydrochloric acid into the conical flask 7. Collect thermometer 8. Measure the starting temperature of the hydrochloric acid 9. Measure 3cm of magnesium ribbon 11. Drop the magnesium into the conical flask 12. Quickly place the rubber bung into the conical flask 13. Start timing with the stop clock 12.Wait to see how long it takes for 30 ml of gas to form. Safety The things that I will need to do to keep my experiment a safe one for myself and other students around me are as follows: � Wear safety goggles as I am using concentrated hydrochloric acid � Care to eyes and the skin besides all the other people is always vital and necessary � Care in using glassware since it is sharp when broken and can cut skin � Safe disposal of reagents and laboratory chemicals � Care when returning all used glassware and equipment at the end of the experiment ...read more.

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This report is very limited with no data, graphs evaluation or conclusion. It seems as though two separate reports have been combined. Only one variable should be manipulated to determine the effect of either temperature or concentration on the rate of reaction.

Marked by teacher Cornelia Bruce 18/04/2013

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