Marble Chips Into The Conical Flask example essay topic

A chemistry investigation to look at the rates of reaction between marble chips and hydrochloric acid. Task My task is to measure the rate of reaction between marble chips (CaCO 3) and Hydrochloric acid (2 Hcl). Diagram Plan The equipment I will be using for this experiment will be as follows: Conical flask, Delivery tube, Bung, Measuring cylinder X 2, Water trough, Water, Stopwatch, Marble chips, Hydrochloric Acid, water scales, clamp and Retort Stand.! WEAR SAFETY GOGGLES ! I will fill the water trough 3/4 full of water and 1 measuring cylinder completely full. When I have done this I will cover the top of the full measuring cylinder, tip it upside down, insuring that no air escapes in to the cylinder.

I will no place the measuring cylinder into the water and leave to rest. I will now measure out 50 ml of 2 Moler Hydrochloric Acid into my 2nd measuring cylinder, and then pour it into the Conical flask. I will next weigh out 0.5 Grams of medium sized Marble chips and put them to the side while I prepare the rest of the experiment. I will place the bungles end of the Delivery tube under the water and into the inverted Measuring cylinder so I can measure the amount of gas produced during the experiment. I will now reweigh my Marble chips to insure that none have been lost. Once that is done my working partner will use the small measuring cylinder to put the Marble chips into the conical flask and as soon as the Marble chips enter the conical flask I will start the stopwatch.

I will now place the bung on the Conical flask so that any gas produced in the experiment will go into the inverted measuring cylinder so we can recorded out results. Every 20 seconds we will measure the amount of gas produced. I will stop measuring the gas production when the gas is not increasing any more. Variables I will use 2 Molar Hydrochloric acid and will be measuring the amount of gas in CM 3. The mass of marble chips will be 0.5 Grams.

I will be using medium sized marble chips, dependant on the mass. I will be doing the experiment at room temperature. Control Of Variables Variable How Controlled Units Concentration (HcL) 2 M, 1.75 M, 1.5 M, 1.25 M, 1 M M Volume (HcL) Constant Cm 3 Mass Of Marble Chips 0.5 Grams G Surface Of Chips Medium, Dependant on mass Number of chips Temperature At Room O Prediction I predict that the weaker the concentration of the Hydrochloric acid, the slower the reaction. Explanation I think this because if I have a 2 Moler solution of hydrochloric acid there will be a certain number of H+ iron particles but if you had a weaker concentration like 1 Moler the reaction would take longer because there are less H+ iron particles to collide with. Method My method is to pour 50 ml of 2 Moler Hydrochloric acid into a conical flask and then put 0.5 Grams of Marble chips into the conical flask as well and time the Rate Of Reaction between the two.

I did this to show the rates of reaction between Hydrochloric acid and Marble chips. My results show a steady in crease in the rates of reaction between Hydrochloric acid and Marble chips. This happens because the weaker the concentration of hydrochloric acid the fewer particles there are to collide with the Marble chips. In my prediction I said that I thought the weaker the concentration the longer the rate of reaction would be. After my experiments this proved to be correct.

Once I had done the graph I realised that I had a few results were anolomisys. The shape of my graph was going up fast at first then it slowed down. Here are a few points about rates of reaction: Rates of reaction I will be comparing rates of reaction for 1 minuet on my graph. The 1 minuet I will be comparing will be from 4 mins -5 mins... 4 Mins 39/240 = 0.1625 CM 3/s. 4 Mins 20 Secs 43/260 = 0.1653846 Cm 3/s.

4 Mins 40 Secs 47/280 = 0.1678571 Cm 3/s Evaluation I think my method was a suitable one although I think I could have added more Marble chips to make the rate of reaction a little faster. I am happy with my method. My Results were pretty accurate but to make them more accurate I could increase my measurements of the gas up an extra tenth to make them that little bit more reliable. To insure our results were as accurate as possible me and my working partner both read the amount of gas produced to insure one of us didn't miss read any of the results. On my graph there are no clear anomalous results. Although my results are a little out of place I think this is because of me measuring the amount of gas on in ten's.

To make this better next time I could read the amount of gas produced a lot more accurately. I could improve my investigation by reading my results more accurately and by increasing the amount of Marble chips. I could extend my experiment by measuring the temperature made from the reaction as well as the rates of reaction..