This website uses cookies to ensure you have the best experience. Learn more

Effect Of Concentration On The Rate Of Reaction

671 words - 3 pages

Introduction:

In this experiment, we utilized the ability for the iodide ion to
become oxidized by the persulphate ion. Our general reaction can be
described as:

(NH4)2S2O8 + 2KI Ã I2 + (NH4)2SO4 + K2SO4 (1a)

However, we know that in an aqueous solution, all of these compounds
except iodine will dissociate into their ionic components. Thus we can
rewrite the equation in a more convenient manner:

S2O82- + 2I- Ã I2 + 2SO42- (1b)

It is important however to note that the NH4 and K ions are still in
the solution, they are just unreactive. In order to measure the rate
of the reaction, the conventional method would be to measure the
species in question at certain times. However, this would be
inconvenient, especially for a three hour laboratory period. Since the
iodide ion can be oxidized by the persulphate ion, we can use sodium
thiosulphate to be an indicator of the presence of iodine in the
solution. For this experiment, we can ...view middle of the document...

If sodium thiosulphate is added to reaction
(1), than as long as there are two moles of thiosulphate for every
mole of iodine, the solution will be colourless because the iodine is
being used up in reaction (2). However, as time passes, the
thiosulphate must run out at some point, and when it does, the violet
colour will appear. Timing how long it takes for the violet colour to
appear will allow us to calculate the rate of the reaction. In this
experiment, 5 mL was also added in order to provide a more accurate
measure of the time at which the colour first appears. Starch is
helpful because it forms a blue complex with free iodine. Once we have
the time elapsed for each run, we can calculate the rate of the
reaction by applying the equation:

Rate = -∆S2O8-2 / ∆t

The change in S2O8-2 is simply half the concentration of S2O3-2
because in reaction (2), the consumption of iodine and persulphate has
a 1:2 ratio. Thus, the consumption of iodine can be seen as half the
consumption of persulphate (S2O3-2). After calculating the rate of the
reaction, the rate constant can be found by using the equation:

Rate = k [ S2O82-]m[I-] n

By comparing 2 sets of data at a time from 2 different runs, the order
exponents 'm' and 'n' can be calculated, and thus, we can write the
rate law for the iodide-persulphate reaction.

We should also expect that the expected relationships between the
concentration of S2O8-2 and the rate of reaction and rate constant
might not always be extremely accurate in this experiment. When
dealing with ions, we must always consider the ionic strength of the
ions involved. The rate of the reaction will increase as the ionic
strength gets stronger, thus, we will not always see a perfect linear
relationship between [S2O8-2] and the rate of the reaction and the
rate constant.

The purpose of this experiment was to perform many trials of the same
experiment, varying only the concentrations of certain ionic compounds
in order to determine the affect of concentration on the rate of a
reaction. By varying the concentration of different compounds for each
run while keeping other factors constant, we were able to obtain
experimental data that would give us a relationship between
concentration and reaction rate.

Other Essays Like Effect of Concentration on the Rate of Reaction

The Rate Of Reaction Of Succinate Dehydrogenase

1537 words - 7 pages (Campbell, et al, 2006). The aim of this study was to investigate the rate of reaction of succinate dehydrogenase, an enzyme extracted from chicken hearts. The rate of reaction was analysed considering two factors: pH and temperature. The ability for the enzyme succinate dehydrogenase to oxidise two alternative substrates (malonate and propionate) will also be examined. Materials and Method Part 1. Effect of pH on enzyme activity Blender 50

Investigating Some Factors Which Affect The Rate Of Reaction

945 words - 4 pages will be faster.·Pressure - When reactions are taking place between gases, increasing the pressure will increase the rate of reaction. This is very similar to the affect concentration has. The molecules are in a more compact space and closer together so more collisions can take place.In the following experiment, the effect of concentration on the rate of reaction between hydrochloric acid and sodium thiosulphate will be investigated

An Experiment To Investigate The Effect Of Changing The Concentration

1153 words - 5 pages An experiment to investigate the effect of changing the concentration of hydrochloric acid on the rate of reaction with sodium thiosulpahte. Aim I am trying to find out how the concentration of hydrochloric acid affects the reaction time with sodium thiosulpahte. If a clear solution of sodium thiosulphate is mixed with hydrochloric acid then a reaction will occur where a creamy-yellow precipitate of sulphur is produced. H20

Effect of Interest Rate and Cash Reserve Ration on Inflation

2516 words - 11 pages research.. 5.Estimation And Result : The model comprises of three variables : inflation (INF), interest (INT) and cash reserve ratio (CRR) . INF = -7.625988 – 0.071858 INT + 3.080686 CRR + µ Adjusted R2 = .372187 According to the results generated interest rate and cash reserve ratio affect almost 37.2% on inflation. THE ORDINARY least square method is used to determine the effect of interest and CRR on the inflation. It showed by

Laboratory Report on Oxygen Bubbling Experiment to Investigate of the Effect of Light Intensity on the Rate of Photosynthesis

709 words - 3 pages Biology Laboratory report on oxygen bubbling experiment to investigate of the effect of light intensity on the rate of photosynthesis Objective To investigate the effect of light intensity on the rate of photosynthesis. Principle of design and Assumptions It is known that light is required in the photochemical stage of photosynthesis. Nonetheless, it is uncertain that if rate of photosynthesis is related to light intensity. Since

An Investigation into the Effect of Light Intensity on the Rate of Photosynthesis on a Piece of Elodea

1997 words - 8 pages An Investigation into the Effect of Light Intensity on the Rate of Photosynthesis on a Piece of Elodea Plan: Method: 1) First I will put some water into a boiling tube and add 5 spatulas of Sodium Hydrogen Carbonate. I will add 5 spatulas of Sodium Hydrogen Carbonate as it reacts with water and forms carbon dioxide; also I have so much so that I have carbon dioxide in excess. 2) Then I will cut off 5cm of

The Concentration Of Hydrogen Peroxide And Speed Of The Rate At Which It Is Broken Down By Catalase

3312 words - 14 pages [IMAGE] Time in minutes NB rate of reaction is the actual number of substrate molecules evolved per minute. Volume of oxygen produced/evolved per minute is not in itself the rate of reaction, but is indicative of the actual rate of reaction. CONCENTRATION [IMAGE] [IMAGE] [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] H2 O [IMAGE] [IMAGE] [IMAGE] [IMAGE] [IMAGE

Rate Of Reaction Of Dilute Hydrochloric Acid And Sodium Thiosulphate

2323 words - 10 pages of the reaction. The reason behind this is that increasing the pressure pushes the gas molecules closer towards each other, and so increasing the chances of the gas particles colliding, causing the reaction to take place at a faster rate. Constant: Pressure is inappropriate to our experiment as no gases are involved, rather liquids. In this investigation, we shall be investigating the effect of changes in concentration on the rate of

Experiment on Rates of Reaction

780 words - 4 pages concentration of acid, the quicker the reaction is going to take place. Main Experiment: Aim: Our aim of this experiment was to investigate the effect of concentration on rates of reaction using different concentrations of sodium thiosulphate and hydrochloric acids. Prediction: I thought that the higher the concentration that we used, the test was going to be a lot quicker but the lower the concentration, the test

Research About the Effects of Mobile Phones Usage on a Driver’s Response Time, Concentration and Attitude

929 words - 4 pages Research about the effects of mobile phones usage on a driver’s response time, concentration and attitude... Mobile phones are the biggest distraction that exist nowadays. One hears the ring tone and gets to their phone as quickly as possible so that they don’t miss out on the last tweet, hashtag or text they just got. All, and if not all, at least 99%, drivers are guilty of checking their phone while driving, putting themselves and other

The Effect of Sarbanes-Oxley on Auditors

2666 words - 11 pages Journal of Finance and Accountancy The Effect of the Sarbanes-Oxley Act on Auditors’ Audit Performance Tae G. Ryu Metropolitan State College of Denver Barbara Uliss Metropolitan State College of Denver Chul-Young Roh East Tennessee State University ABSTRACT The issue of audit reporting for financially distressed firms continues to be of interest to the public and to legislators. Previous studies have consistently shown that auditors

Related Papers

The Effect Of Temperature On The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid

1841 words - 8 pages The Effect of Temperature on the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid I predict that as the temperature is increased the rate of reaction will increase. This means that the graph drawn up in my analysis will have positive link so it will look something like shown below, and will probably be curved as the increase in rate of reaction will not be exactly the same as the temperature is increased

The Effect Of Varying Heart Rate On Choice Reaction Time In Young, Physically Active Males

1025 words - 5 pages CRT in highly skilled fencing athletes, whilst having no effect on the sedentary population (Mouelhi Guizani, S. et al, 2006). Therefore, this experimental study is designed to determine the effects of varying heart rates upon CRT within a young, physically active male population. Purpose The aim of this experiment is to investigate the effect heart rate has on reaction time. The information that is obtained will be of interest to athletes

An Investigation To Find Out How The Concentration Of Hydrochloric Acid Affects The Rate Of Reaction With Calcium Carbonate

2741 words - 11 pages ' Collision Theory'. This is when particles react when they collide, due to their kinetic energy. The higher the concentration of particle, hence more chance of a collision. Other input variables [IMAGE] I am experimenting concentration on the rate of reaction. However, the other types of variables I could have used which would have affected the reaction are: i) The temperature, ii) the surface area of the

The Effects Of Concentration Of Sugar On The Respiration Rate Of Yeast

1555 words - 7 pages The Effects of Concentration of Sugar on the Respiration Rate of Yeast Investigating the effect of concentration of sugar on the respiration rate of yeast We did an investigation to find how different concentrations of sugar effect the respiration rate of yeast and which type of concentration works best. Respiration is not breathing in and out; it is the breakdown of glucose to make energy using oxygen. Every