• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

An investigation into the behaviour of mono-di-tri protic acids with a pure metal.

Extracts from this document...

Introduction

Investigating advanced reaction rates. Aim In this investigation I will examine how certain variables affect the rate of reaction. In particular I will attempt to evaluate the orders of the reactions, and whether this order is confined to a certain concentration range, and also I will aim to approximate the activation energy through observing the effect of temperature on the rate of reaction. I will be using Magnesium (alkaline earth metal) during all of my reactions and a range of acids. For a successful outcome, careful planning must be undertaken, where preliminary work will be of key importance in determining quantities and ranges of reactants, and temperatures to use, as well as selecting the most appropriate apparatus and laboratory techniques to be used in the full investigation. Theory In this section I will explain the theoretical chemistry of the variables in my investigation, through my understanding of rates of reactions as well as the use of information from various sources including, books, the internet, and encyclopaedias which will be fully listed at the end of this project. The rate determining step of a chemical reaction is one which is the slowest, and it is this which is represented in a rate equation. The rate equation cannot be calculated from the balanced chemical equation, but has to be found through experimental procedures. ...read more.

Middle

When a variable is changed, all he others must remain constant in order to ensure a fair test, and that I can be certain that only the changing variable is affecting the reaction. For example, if when the temperature is changed, I must ensure that other factors such as surface area, temperature, concentration and type of acid must remain constant and the same is repeated for each experiment. Risk assessment To ensure that my experiment will be carried out safely, safety goggles will be on at all stages of the experiment, and protective clothing must be worn at all time whilst conducting the investigation. The practical will be carried out in plenty of space, clear of bags and coats. It is also imperative to consider the safety of other pupils that may be close to the practical. Therefore no one who is not involved in the practical shall be allowed in close vicinity of the experiment. 2M Hydrochloric acid is a corrosive, irritant substance, and so care will be taken to avoid contact with skin and preventing spillages. Care must be taken with all other acids, and when making different concentrations. Although only small volumes of Hydrogen gas will be produced, my experiment will be positioned away from open flames, due to the flammability of Hydrogen and the potential danger this can cause. ...read more.

Conclusion

This is just an approximate value, as errors are introduced due to the equipment that was used, such as the thermometer and stop watch, and human error in determining when the solid magnesium strip had fully dissolved. This value is in the range of the values obtained by reordered by other students, and is close to the mean value of 23 KJmol-1. Conclusion In this final part of the report I will bring together all of the data that I have analysed, and see whether I have achieved my aims outlined in my plan. Firstly, the orders and the rate equations for the different types of acids, hydrochloric, sulphuric, and phosphoric acid at room temperature were obtained. The hydrochloric acid reaction gave a first order reaction, where the concentration vs. time graph showed exponential decay, the half life seemed fairly constant, as it always took approximately (given the possible errors) the same amount of time for the concentration to halve.. For the diprotic, Sulphuric acid I found that the order was likely to be second due to the half life not being constant, it increased as the reaction went on. As for the phosphoric acid, it was unclear whether it was first or second order. However, having drawn first order plots it seemed that I as more likely to be a first order reaction. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Inorganic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Inorganic Chemistry essays

  1. Peer reviewed

    Determining the concentration of acid in a given solution

    5 star(s)

    the amount inside, as the neck of the flask is so narrow. I could measure the solid into a small beaker on the balance, and then dilute it and pour the liquid into the volumetric flask. I would have to rinse the beaker with distilled water quite a few times

  2. effects Concentration and Temperature on the Rate of Reaction

    This means that the temperature of an equation must always be known when working out the rate of reaction. Several different things contribute to a change in rate of reaction which concerned in my experiment: * Concentration * Temperature * Collision Frequency * Activation Enthalpy The Collision Theory can account

  1. Determining an Equilibrium Constant

    and NaOH(aq) react in equimolar amounts, so, 2.> Total amount of acid at equilibrium in bottles 2,3 & 4 = no. of moles of HCl(aq) added + CH3COOH(l) formed = concentration of NaOH(aq) x volume of NaOH(aq) added 3.> Equilibrium amount of CH3COOH(l)

  2. Lab report Determination of Enthalpy Change of Neutralization

    H2S (aq) + H2O (l) HS- (aq) + H3O+ (aq) In fact, there is no hydrogen ion formed in the solution of the process of dissociation, so energy is needed for has lost to push the reaction towards right side and the formation of hydrogen ions.

  1. Aim To study the effect of concentration of iodide ion ...

    1.0 mol dm-3 solution, sodium thiosulphate Na2S2O3 0.05 mol dm-3solution, starch solution, test tubes, test tube rack, beakers, volumetric flasks, conical flask, distilled water, retort stand with clamp, pipette filler, spatula, dropper Experimental Procedures i) Preparation of chemical solutions 1.

  2. Chemistry - Data Analysis

    53 53 54 58 58 59 58 57 57 14 53 58 57 16 50 50 51 55 55 55 55 55 54 16 50 55 55 18 49 48 49 54 53 53 53 53 52 18 49 53 53 20 47 46 47 51 50 51 51 51

  1. Aim: To determine the activation energy of the reaction between bromide ion and bromate(V) ...

    Based on the results, is it advisable to perform the experiment at high temperature such as 80 �C? The reaction is very fast at a high temperature, and the reaction time is too short (say, about 1 second or even less)

  2. How metals react with Acids

    How Metals react with Water: When a metal reacts with water it displaces the hydrogen in the water.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work