Your school answer is the most correct. The high affinity of the hydrogen ions to oxygen splits apart the carbonate group, covalently bonding with one oxygen ion to form a water molecule. If you were to use cubed limestone it wouldn't be fair as no cube will be exactly the same size. The concentration of acid remained the same throughout the preliminary experiment because it was the values for the constants that we are finding out. The action of chewing mechanically breaks down very large aggregates of food molecules into smaller particles. This is again due to collision theory.
The reaction rate is how quickly a reaction occurs and this can be affected by four different factors: ¡¤ changing the surface area of any solids involved ¡¤ changing the concentration of reactants in solution ¡¤ changing the temperature… 1292 Words 6 Pages the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate Chemistry Coursework How Concentration Affects a Reaction Aim: The aim of this experiment is to find out how concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate. However, if this energy is not produced, a reaction will not take place, so not all collisions result in a reaction. Answer to 3 significant figures. Then, every 10 seconds I will take down the measurement on the 100 cmÂ³ measuring cylinder. When the temperature is increased all the particles move quicker, therefore there are more collisions. The amount of calcium carbonate. In this investigation I will be varying the concentration of Sodium Thiosulphate only and not the Hydrochloric acid concentration.
Before any change takes place on the collisions the molecules must reach a minimum kinetic energy called the Activation energy. During the execution of my practical I was very accurate with my measurements and tidy with my work space. Additionally catalysts was not the variable I chose, because this would only give me two results — whether the rate of reaction is faster with the catalyst or whether it is faster without the catalyst. Crichton already answered that question, Tina. My new list of apparatus looks like this: · Thermometer. Discussion: As shown in the graph and table above, each test had a very similar result to the other tests of the same concentration. There were certain control variables which we had to make sure did not affect our results.
Introduction: This experiment will be carried out by drawing a cross on a piece of paper and mixing hydrochloric acid and sodium thiosulphate together to see if the cross disappears. A reaction occurs when particles collide. You need some carbonate, some scale from mum's kettle, bicarbonate of soda from the kitchen or some marble chips from the driveway. Additionally the amount of carbon dioxide given out can me measured accurately and fairly quickly. It is this reaction that is responsible for limestone fizzing when dilute hydrochloric acid is placed on its surface. Erosion is evident when you look at older marble buildings as in certain cases the erosion take a long time. This is because it is the hydrochloric acid and the calcium carbonate, which react by collision theory.
If it spills on the desk, I will inform the teacher and clean it without getting it on my hands or clothes. Concentration; the higher the concentration the faster the reaction because there would be more Hcl to bump' into CaCo3. This is an exchange reaction, the products of which are: a weak and unstable compound, carbonic acid which breaks down into carbon dioxide and water. So when working with strong acids, you should always have neutralizers at hand — weak alkaline solutions, kitchen soda etc. By starting at a low temperature, the particles do not collide with much energy giving a slow reaction. · I will heat the hydrochloric acid to 30 degrees. Pity you didn't even attempt to disguise the question, but have asked it exactly as written either on the teacher's board or the text book! Does it form a milky white solid ppt and an alkaline pH? These are the results I got from my experiment: Room temperature - 22 degrees centigrade: Time seconds Volume of gas attempt 1 cm3 Volume of gas attempt 2 cm3 Average volume of gas cm3 0 0 0 0 20 3 3 3 40 4 4 4 60 5 6 5.
We then decreased the amount of Calcium Carbonate to 1g and kept the same 25cm³ of 3 molar hydrochloric acid and 10 second intervals. I saw an episode of House once where taking too much calcium carbonate harmed someone. The reaction rate is how quickly a reaction occurs and this can be affected by four different factors: ¡¤ changing the surface area of any solids involved ¡¤ changing the concentration of reactants in solution ¡¤ changing the temperature at which it is carried out ¡¤ the use of a catalyst I am going to investigate into exactly how one of these variables affects the reaction rate and I believe the most suitable variable to change is the concentration of the solution as all necessary equipment is available within the school chemistry lab, and five results can be obtained easily and within the time allowance. The factor that I will investigate is concentration. Surface area of a solid. We then flipped the cylinder upside down and put it into the plastic tube, and attached one end to the clamp stand We poured our hydrochloric acid solution into the flask, and attached the gas burette to the flask We the put the other end of the gas burette into the measuring cylinder When ready, we put the calcium carbonate tablet into the flask and began the timer Every 5 seconds, the amount of water lost from the measuring cylinder was measured and the results were recorded Once over 50cm3 Carbon Dioxide has entered the cylinder, the timer is stopped and a new experiment is set up For our experiment we had to take several safety precautions. Safety goggles for eye protection are recommended and lab coats are.
The rate of reaction between sodium thiosulphate and hydrochloric acid Candidate name: Yeo Jin Kim Kimberly Kim Candidate number: 000791-021 Teacher: Yitao Duan 1. The temperature of the hydrochloric acid. I predict that the higher concentration of acid, the higher the rate of reaction. Therefore, my hypothesis is: the reaction will be faster when using small This increased the accuracy of the obtained results. I was just curious whether all metals react with acids, because I remember hearing from somewhere that gold and silver won't react. Not only was it a more advanced and more calculated experiment it, the results reflect what I was trying to find out in a clear and exact manor. Does it form a milky white solid ppt and an alkaline pH? The combination of the acid naturally produced by the stomach and the base ingested in the form of , either through a food source or a mineral , will cause the neutralization of both compounds and the creation of by-products that are neither acidic nor basic.
While both acids and bases can cause chemical burns, the neutral molecules formed after they react with one another can pass through a person's digestive system without causing the person any harm. Concentration does not increase the number of successful reactions per second; however both temperature and the use of catalysts, two other independent variables, do increase the number of successful reactions per second. Ok this is the net ionic equation for this reaction:. Maybe the school administrator and the science teacher who talk to me about this issue are exaggerating? Introduction In the experiment the magnesium reacts with the hydrochloric acid to create magnesium chloride and hydrogen. I further predict as the temperature rises by 10° C the rate of collisions will also double. I hope that some day that will change somehow. Add several pieces of marble to the vessel and drip hydrochloric acid on it with the pipette.