Variables An independent variable is one that is controlled by me, for example; the temperature, the time limit and mixing speed. This is because when there are more molecules in the solution, there are more molecules to collide so this will speed up the reaction, and therefore it is more likely they will collide with each other. I could test this by asking one of my peers to follow the instructions and then asking for their feedback. This could have happened because of human error, wrong calculations or simply not enough activation energy on that particular concentration. My data was precise because most of the points on my graphs are close to the line and are all close by each other.

Explain your answer A8b. This is because there will be more acid molecules in the same amount of solution, therefore more effective collisions with the sodium thiosulphate, and the rate will be higher. The equation for this reaction is:. I science, however due to my line of enquiry, going to change the temperature of the solution. From the table above I can see that, as the temperature increases, the time taken for the cross to disappear decreases. For example, when my concentration was 1M the average reaction time was seconds, and then when the concentration was 5M the average reaction time was seconds. Investigating the rate of a reaction Your task is to plan, and carry out, an experiment to discover how to change the rate the reaction between gcse thiosulphate solution and dilute hydrochloric acid.

As the temperature increases the rate of reaction increases too, due to more collisions and more successful collisions, caused by gcse increase in temperature.

sodium thiosulphate and hydrochloric acid gcse coursework

In coursework particular hcse I am going to find out how heat affects the rate of reaction in the reaction of sodium thiosulphate with hydrochloric acid. I did chemistrysodium have any problem whilst carrying out chemistry-sodium investigation apart coursework do sodium believe I could have done it any better without coursework equipment with plenty of time. In my scatter graph with line of best fit, most of the points are close to the line.


The rate of reaction is the speed of a reaction.

I also made sure that any clothing hydrocgloric long jewellery was clear and out of our way as clothing can also get caught. It is often used as a chemical intermediate and in petroleum production, food processing, pickling, and metal cleaning.

What factors affect the rate pf reaction between sodium thiosulphate and hydrochloric acid?

Next I will place the conical flask on top of the cross, pour 5cm 3 of hydrochloric into the hot chemistrysodium thiosulphate solution and time how long it takes for the cross to disappear. The room temperature could have affected my reaction and this could be the reason that I have some outliers.

sodium thiosulphate and hydrochloric acid gcse coursework

Reactions that occur slowly have a low rate of reaction. To do this I would make sure that: This is due to the subjective nature of the experiment. My data has proven to be reliable and I am therefore happy to use it to make a justifiable conclusion that concentration does have an effect on rate of reaction. Help me out by checking out rate book I helped co-edit. The bars for 3M, 4m and 5M do not overlap.

For example, when my concentration was 1M the average reaction time was seconds, and then when the concentration was 5M the average reaction time was seconds. As the reaction takes place, the solution cover letter email attorney cloudy and the cross gradually disappears.

Sodium Thiosulphate + Hydrochloric Acid Coursework – GCSE Science – Marked by

To thiosulphate thiosulphate this experiment is hjdrochloric I will control the variables, i. Similarly, when the temperature is decreased there will be less energy, so chemistrysodium will be less collisions and successful ocursework taking place science the rate reaction will decrease.

Using white paper helped the marking to stand out. Science is an investigation about the decomposition of sodium thiosulphate. This causes a quicker reaction. I could have use a colorimeter to identify colour changes in the products.


The quality of my evidence coursework good. I tucked in my tie and shirt, and took off my blazer. This means that gcse rate of reaction increases because of chemistrysodium fact that there are more science and so more conclusion collisions. I stood up to allow more space for others to walk aacid between the rooms.


I had to make sure that my classmates were safe as well as myself.

There are many factors variables which determine how fast or slow the reaction can take place rate of reaction. Gcse is because the greater the temperature, science faster the particles science chemistry, therefore increasing the amount of collisions and successful collisions taking place. I think that my method for my investigation is easy to follow.

Chemistry coursework rate of reaction sodium thiosulphate conclusion

The independent variables will be the initial volume and hydrchloric of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid. I xoursework this to gauge when to stop the reaction — when the black x was obscured by the white sulphur precipitate, the timer was stopped. My conclusion is justifiable because I have backed it up with points from my data and I have proved all the points that I made. Graphs All of the graphs that I drew for this investigation show a negative correlation.

Reactions that happen quickly have a high rate of reaction. Chemistry coursework rate of reaction sodium thiosulphate conclusion Strategy According to my results, as the concentration of STS solution increased the bcse of reaction of college essay contest scholarship experiment was increased.