The range of my results were also suitable to make good observations and conclusions By comparing the repeated times on each of the experiments I can see that they were similar and each one was within two seconds of each repeat.
I will keep everything constant apart from the variable I am changing-temperature. The advantage of this approach is that thiosulfate is essentially not toxic and that ore types that are refractory to gold cyanidation e. Results Below is a table showing my results from the main investigation I can see from observing the table that the first part of my prediction was correct.
I did not have any problem whilst carrying out my investigation apart and do not believe I could have done it any better without specialist equipment with plenty of time. Variables There are different variables which can be changed. As the temperature increases the rate of reaction increases too, due to more collisions and more successful collisions, caused by the increase in temperature.
November Learn how and when to remove this template message Sodium thiosulfate is also used: Initial protonation occurs at sulfur.
There are no anomalous results which shows that the experiment was very accurate. On each experiment I will take three readings and work out an average from the data I have obtained. This might have occurred for several different reasons, such as the fact that the temperature control might not have been exactly the same or that my judgement of when the cross may have disappeared might not have been exactly the same for each one.
Evaluation All of my results were accurate and fitted the pattern of results. As a component in hand warmers and other chemical heating pads that produce heat by exothermic crystallization of a supercooled solution.
The anhydrous salt exists in several polymorphs. This section needs additional citations for verification. Solutions of sodium thiosulfate are commonly used as a precaution in chemistry laboratories when working with bromine and for the safe disposal of bromine, iodine, or other strong oxidizers.
It is a somewhat strong acid with pKas of 0. There were no points on my scatter graph that were not on or close to the line of best fit. It also has a line of best fit to show the consistency and accuracy of the results.
I will also be careful when heating up the solutions and will at all times wear safety goggles and also remain standing throughout the experiment. This means more of the particles collide and more of the collisions result in a reaction, so the rate of reaction increases.
Below is a table to show the effect of changing different variables. To further investigate the decomposition of sodium thiosulphate I could change the concentration of hydrochloric acid and sodium thiosulphate or use a catalyst in the reaction.
Furthermore, the graph is a perfect curve It is obvious that there is a general trend in the results. Please help improve this article by adding citations to reliable sources. Furthermore I will measure out the volumes of both the sodium thiosulphate and hydrochloric acid to the greatest degree of accuracy I can manage.
Production[ edit ] On an industrial scale, sodium thiosulfate is produced chiefly from liquid waste products of sodium sulfide or sulfur dye manufacture.
I could also change the initial volume of either the hydrochloric acid or sodium thiosulphate solution and see if I get a similar pattern of results. Tripod Method Firstly I will draw a small dark cross on a piece of paper and place it on a bench mat.
In pH testing of bleach substances, sodium thiosulfate neutralizes the color-removing effects of bleach and allows one to test the pH of bleach solutions with liquid indicators.
The quality of my evidence is good. This reaction is employed in one synthesis of the industrial reagent thioglycolic acid: The relevant reaction is akin to the iodine reaction: As part of patina recipes for copper alloys Often used in pharmaceutical preparations as an anionic surfactant to aid in dispersion Structure[ edit ] Two polymorphs are known of the pentahydrate.
Sodium thiosulfate medical use It is used as an antidote to cyanide poisoning. From this evidence I believe my results were very reliable. Data are limited on this method with few recommendations. It may be instilled subcutaneously into multiple sites using a small-gauge needle.
Safety I will make sure I handle the sodium thiosulphate solution and hydrochloric acid with care. Sodium thiosulfate, when heated, dissolves in its own water of crystallisation.Chemistry Coursework Planning Aim: To find the effect of concentration of thiosulphate on the rate of reaction between sodium thiosulphate and hydrochloric acid.
In this experiment I will be seeing how the concentration of Sodium Thiosulphate, Na2S2O3, and Hydrochloric Acid, HCl, affects the rate of the reaction.
In this reaction the solution turns milky yellow as sulphate is displaced and forms a solid precipitate. - Rates of Reaction Coursework. Introduction. In this piece of science coursework I will be experimenting how the rate of reaction between Sodium thiosulphate and hydrochloric acid is affected by the concentration of Sodium thiosulphate.
How concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate 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.
Sodium thiosulfate (sodium thiosulphate) is a chemical and medication. This reaction is known as a "clock reaction", because when the sulfur reaches a certain concentration, the solution turns from colourless to a pale yellow.
This reaction has been employed to generate colloidal sulfur. Jul 02, · The independent variables will be the initial volume and concentration of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid.
Below is a table to show the effect of changing different ultimedescente.coms:Download