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# Find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid.

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Introduction

Experiment Aim To find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid. Apparatus Marble Chips Conical Flask Hydrochloric Acid Gas Syringe Delivery Tube Stop Watch Fair Test To make the experiment a fair test I will use the same amount of acid for each concentration. I will do this by using a capillary tube because they are very accurate. I will use 3g of marble in each concentration of acid. I will clean everything out before I start the next experiment with a different experiment. Safety Magnesium is flamable and when it reacts with acid an exothermic reaction takes place releasing a large amount of heat energy. Acids are corosive so saftey glasses must be worn. Method I will use Marble chips all of a small size. I have decided to use 3g or marble chips. The amount of acid I have decided on is 20ml. I will measure this by using a burette, a very thin tube that lets out the acid when you turn the tap; it gets very accurate amounts of acid. ...read more.

Middle

Also if the particles have more energy, they will be travelling faster, making them collide more frequently. Variables/Factors Variables 1. The amount of marble chips will not vary because more marble chips would produce more gas when put into the HCL, so a weaker concentration of acid, could end up looking stronger than a stronger concentration of acid. 2. The amounts of acid will not vary because more of a weaker concentration could be as strong as a little of a stronger concentration, which would make an unfair test. 3. The strength of the acid WILL vary because the whole point of the experiment is to see how much gas is produced at different concentrations of acid. 4. The apparatus used will be the same every time because other pieces of apparatus may have a different scale, the syringe may be stiffer. Etc. 5. The time between measurements will not change so you can see how much gas is produced in the same amount of time. 6. The temperature will have to be the same in each experiment because 10 Factors 1. We will take measurements every 10 seconds 2. ...read more.

Conclusion

(You can see ive circled this in the graph) Although I have some ideas which may gain a more accurate reading. Firstly, the surface area of the marble chips were not perfect. It could have been made better if I had used powdered marble chips because the surface area of each wieght of powder would have been a lot similar. If I did use Powder however, the concentration of acid may have had to be weakened as the reaction would have taken place a lot quicker due to the very large surface area and readings wouldn't have been as accurate. Secondly, an inaccuracy may have been caused by the fact that the temperature may have dropped during the reaction. This could have been used if I used a water bath to heat up the acid to a constant temperature. You have to allow for a margin of human error during the experiment, some people react slower than others and you have to rely on the person taking the readings with the stopwatch. The results were reliable because they were almost the same in both experiments, even though there was an anomalous result; it happened in both experiments, so the results were still relibale, I have no explination for the anomalous result. ...read more.

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