The effect of concentration of acid on the rate of reaction between nitric acid and marble chips.
Introduction
Aim: the aim of my experiment was discover how much, if any the effect is of the concentration of acid on the rate of reaction for the reaction between nitric acid and marble chips. I am looking into this to solve the problem that I have been set, which is to find out what the effect of acid rain is on limestone and if the acidity is increased, does the rate at which it reacts increase also, and if so by how much.
Prediction: my prediction is that the higher the concentration of acid the faster the rate of reaction as well as the more CO2 produced, I predict this because of my previous scientific knowledge as well as the results of my preliminary experiment.
My Previous Scientific Knowledge: I know that according to particle theory, the higher the concentration of acid the more likely that one of the acid particles and not a H20 particle will come into contact with the marble chips and so the more often that the acid particles will react with the marble particles, meaning the reaction will take place faster and produce CO2 more quickly also since I am changing the amount of acid to experiment with concentrations, (e.g. if I wanted to make a 0.4 molar solution I used 6cm3 of acid and 9cm3 of water, instead of 15cm3 of acid and 22.5cm3 of water.) (This was because if there was more acid rain in a place does not mean that it is going to rain more, so I did not want to change the volume of the solution of nitric acid.) There will be more nitric acid to react, consequently more CO2 produced. Also there are other factors that can cause different rates of reaction, temperature for example, the higher the temperature the faster the rate of reaction, this is because temperature is actually a measure of how fast particles are moving and the faster they are moving the more likely they are to collide. Also I know that below a certain temperature, the reaction will not take place, this is because there is not enough activation energy, activation energy s the minimum amount of energy required to start the reaction. If I were to conduct my experiment below this temperature then the reaction would not take place. I.e. consider it a game, and the object of the game is to injure yourself and other people so that you can leave the room. Or have a pillow up your shirt. The rules are that you are blindfolded, and some of the people are a solid (marble chips) and cannot move but the others are a liquid (the Nitric acid) they can move around. They also have to move around a room a certain speed. But you also have other people, they are the H2O particles, and they are unreactive in terms of this experiment they do not injure themselves or other people when they collide, no matter how fast they run. They have pillows shoved up there shirts. If say you walk around the room, then even if you do bump into someone then you still will not inflict any harm on yourself or the other person. This is like being at a low temperature, below the required activation energy, The reaction will not take place, though say at a higher temperature, this is when the people start to jog or run and do inflict damage on the people standing still when they collide and when they do, one of them has a pillow shoved up his shirt and becomes an unreactive H2O particle and the other one leaves the room, he is a CO2 like when the particles react. Also the faster you run - the higher your temperature, the more often you are going to bump into someone else. If you have more of the people with pillows up their shirts, or less people without the pillows, then it is more likely that a H2O particle will hit the solid and will not react. The reaction is slower.
Introduction
Aim: the aim of my experiment was discover how much, if any the effect is of the concentration of acid on the rate of reaction for the reaction between nitric acid and marble chips. I am looking into this to solve the problem that I have been set, which is to find out what the effect of acid rain is on limestone and if the acidity is increased, does the rate at which it reacts increase also, and if so by how much.
Prediction: my prediction is that the higher the concentration of acid the faster the rate of reaction as well as the more CO2 produced, I predict this because of my previous scientific knowledge as well as the results of my preliminary experiment.
My Previous Scientific Knowledge: I know that according to particle theory, the higher the concentration of acid the more likely that one of the acid particles and not a H20 particle will come into contact with the marble chips and so the more often that the acid particles will react with the marble particles, meaning the reaction will take place faster and produce CO2 more quickly also since I am changing the amount of acid to experiment with concentrations, (e.g. if I wanted to make a 0.4 molar solution I used 6cm3 of acid and 9cm3 of water, instead of 15cm3 of acid and 22.5cm3 of water.) (This was because if there was more acid rain in a place does not mean that it is going to rain more, so I did not want to change the volume of the solution of nitric acid.) There will be more nitric acid to react, consequently more CO2 produced. Also there are other factors that can cause different rates of reaction, temperature for example, the higher the temperature the faster the rate of reaction, this is because temperature is actually a measure of how fast particles are moving and the faster they are moving the more likely they are to collide. Also I know that below a certain temperature, the reaction will not take place, this is because there is not enough activation energy, activation energy s the minimum amount of energy required to start the reaction. If I were to conduct my experiment below this temperature then the reaction would not take place. I.e. consider it a game, and the object of the game is to injure yourself and other people so that you can leave the room. Or have a pillow up your shirt. The rules are that you are blindfolded, and some of the people are a solid (marble chips) and cannot move but the others are a liquid (the Nitric acid) they can move around. They also have to move around a room a certain speed. But you also have other people, they are the H2O particles, and they are unreactive in terms of this experiment they do not injure themselves or other people when they collide, no matter how fast they run. They have pillows shoved up there shirts. If say you walk around the room, then even if you do bump into someone then you still will not inflict any harm on yourself or the other person. This is like being at a low temperature, below the required activation energy, The reaction will not take place, though say at a higher temperature, this is when the people start to jog or run and do inflict damage on the people standing still when they collide and when they do, one of them has a pillow shoved up his shirt and becomes an unreactive H2O particle and the other one leaves the room, he is a CO2 like when the particles react. Also the faster you run - the higher your temperature, the more often you are going to bump into someone else. If you have more of the people with pillows up their shirts, or less people without the pillows, then it is more likely that a H2O particle will hit the solid and will not react. The reaction is slower.
