Carbonate and hydrochloric acid Essay Example for Free

Carbonate and hydrochloric acrimonious EssayIf you have a 2 fixed masses of hydrochloric window pane, which have both been crushed up, the one with the sm altogetherer particles will have a higher crop of reception, due to the fact that on that point is a higher surface ara subject to the hydrochloric dosage. A good vitrine to compargon this to would be slicing a loaf of bread, then bed cover butter on it. The more thinner you cut each slice of bread, the more you net loaf which guesss that you would be able to spread more butter. This type of theory is known as the bread and butter theory and is often employ in biology.The higher surface ara of marble chips there is that is in contact with the hydrochloric acid, the higher the ordain of reaction, and the more products that are form in a inclined amount of time. Light Some chemical reactions are affected by the bearing of rest. One example of a reaction that depends on the front line of sunlight is photosynt hesis, which only takes place when sunlight falls on a plant, which contains green pigmentation called chlorophyll. Another example of a reaction that only takes place in the presence of light is that which occurs when a photograph is taken.Inside the camera is a transparent film, which a clear pliant film that is covered in an emulsion of a layer of gelatine which is filled with millions of tiny crystals of silverish halides, especially silver bromide (AgBr). The emulsion that is used is similar for both colour and black and snow-clad film. The only difference is that the colour film contains three layers of emulsion which all contain different dyes. When light falls hits a silver bromide molecule, silver cations (Ag+) accepts an electron from the bromine ions (Br-) creating a silver atom. Ag+ + e- Ag Silver ion + Electron Silver atomThe bromine atoms that are produced are then confine in the gelatine. The more light that hits the photographic film the greater the amount of sil ver that is deposited. As you can see, most of the ways of increasing the consecrate of reactivity involve increasing the tally of successful collisions at heart the reaction itself. Once you do this the rate of reaction should increase. However, just increasing the number of collisions doesnt necessarily mean that the rate of reaction is increased. This is because in assure to increase the rate of reaction you need to increase the number of successful collisions.When collisions occur, if they do not have enough energy, which is in the form of kinetic energy, then they would gross out each other. However if they do have enough energy, then they would combine, which is a successful collision. The way in which the rate of reaction is calculated is by using the following formula reply rate= remove in amount (or concentration) of a substance/products produced Time taken Therefore, in this case, I will be measuring the rate of reaction by measuring the quantity of products formed. The formula would then be Reaction rate= carbon dioxide produced.Time taken Using this method you can work out the intermediate rate of reaction amongst calcium carbonate and hydrochloric acid in the time given for the experiment. The rate at which it reacts would be measured in x grams/minute. Aim The aim of this experiment is to see how the rate of reaction can be affected by a factor variable. The variable that we chose was the concentration of the acid, so the aim is to see how the concentration of hydrochloric acid can affect the rate of reactivity. Prediction Substances are habituated to burn much faster in the presence of oxygen.For example a charcoal in a barbeque would often be burning quite slowly with a red glow. However, when you blow on t, the coal would become even hotter as it gets more red, and my even burst into flames. This is as you are blowing a higher concentration of oxygen onto it. Another example is acetylene, which burns extremely rapidly in the presenc e of pure oxygen. The energy produced, in the form of hotness, is enough to burn through metal, which is what it is used for C2H2 + 2. 5O2 2 carbon dioxide + H2O + heat Acetylene + Oxygen Carbon dioxide + Water + heat energy.Chemical reactions occur when successful collisions occur between particles. This is when particles gain enough speed that when they collide with each other they join together. Successful collisions between acetylene molecules and oxygen molecules occur when pure oxygen is used instead of air. Therefore, the rate of reaction increases the rate of reaction as well as increasing the amount of heat given off. From this, I can indeed pretend that as you increase the concentration of the hydrochloric acid, you would also be increasing the rate of reaction.I predict that the shape of the graph would look like so This is as the rate of reaction at the opening would be quite rapid. This would eventually slow down due to the fact that the calcium chloride and the hydr ochloric acid are being used up. I therefore predict that the shape of the graph would eventually take aim off, and all of the lines (the concentrations) should end up at the same level in the end. Preliminary Investigation There are two methods that may be used to measure the rate of reaction, which are * How fast the reactants are used up.How fast the products are formed The method we are using is to measure how fast the products are formed in this case how fast the carbon dioxide is formed. Preliminary experiments were performed beforehand to understand how the actual experiment should be carried out, decide on the quantities of substances used as well as comprehend the observations in the experiment, i. e. effervescence, in order to acknowledge the reaction. First, we had to decide on the concentration of hydrochloric acid used. The fist concentration that was tried was 3 molar, which I distinct was too fast.This was as the reading on the gas syringe went above the maximum lev el quite rapidly, which is not sufficient as it means that the results would not be adequate enough to rank a trend, which is the main aim of this investigation. The next concentration level that was tried was 2 molar, which I decided was adequate enough for the maximum concentration. Even though the reading in the gas syringe did go above the maximum, I did keep in mind that I was going to be using a larger gas syringe for the actual experiment.Therefore the maximum concentration of acid that is going to be used is 2 molar, which is the variable. We are then going to reduce this to 1. 8 molar, 1. 6 molar, 1. 4 molar, 1. 2 molar and then finally 1 molar. I believe that these sets of variables would be adequate enough in order to identify a trend. After deciding on the quantities used, I then had to decide what gaudiness of acid I was going to be using. The first volume I tried was 0. 5ml, which was too slow. I then tired 10 ml, which was again proving to be quite a slow reaction.S o I then doubled the volume of the acid, which I believed was satisfactory, as the rate of reaction was good, and the amount of co2 produced was satisfactory, as it did not go over the syringe limit. I then had to decide what mass of calcium carbonate chips I had to use. The first mass that I had tried was 0. 5grams, which produced a far too slow rate of reaction. I then tried 2 grams of calcium carbonate, which was too fast of a reaction, and the amount of CO2 produced was off the reading on the gas syringe, so I halved it to 1 gram, which was satisfactory.The amount of time I am going to use is 90 seconds (one and a half minutes) as I believe that this is a sufficient amount of time in which I will be able to identify every trend between the concentration of hydrochloric acid and the amount of carbon dioxide produced. Here are the results for the volume of acid Concentration of acid 1M Mass of marble chips 1. 0 gram Volume of acid used 5 ml. Time (s) Concentration of acid 1M Mass of marble chips 1. 0 gram Volume of acid 10 ml Time (s).Concentration of acid 1M Mass of marble chips 1. 0 gram Volume of acid 20ml TConcentration of acid 1M Mass of marble chips 1 gram Volume of acid 20ml Time (s) + Here are the results for the concentration of hydrochloric acid Concentration of acid 2M Mass of marble chips1 gram Volume of acid 20ml Time (s) 2 produced (cm3) + Concentration of acid 1M Mass of marble chips 1 gram Volume of acid 20ml Time (s)(cm3) The overall result for the preliminary investigation using the correct quantities would be Time (s) 1 produced (cm3) with 1M The graph for the preliminary investigation looked like thisShow preview only The above preview is unformatted school text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.