• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4

# To watch and keep record of the effects of a change in concentration on the rate of reaction.

Extracts from this document...

Introduction

Rate of Reaction Aim: To watch and keep record of the effects of a change in concentration on the rate of reaction. Word equation: Hydrochloric Acid + sodium thiosulphate --> Sulphur dioxide + Sodium Chloride + water 2HCl + Na2S203 --> 2Na + SO2 + H2O Plan: In this experiment I will be testing the rate of reaction of Hydrochloric acid and Sodium Thiosulphate. The rate of reaction tells us how quickly a reaction happens, so I will increase the concentration of the hydrochloric acid each time I do the experiment, adding 1/4 of distilled water to 2 molars of the acid therefore providing us with the concentrations 2, 1.5,1,0.5 and finally 0 to react with the acid. I will do a pretest first to see if the amounts of acid and Sodium Thiosulphate work and to see if there won't be any anomalous results. Equipment: Diagram of equipment: 2x beaker 4x conical flask 2x measuring cylinders Funnel X board Stopwatch Prediction: I predict that each time we increase the concentration of the Hydrochloric acid the amount of time it will take ...read more.

Middle

We will place this beaker over a cross on a piece of paper, we will look through the beaker at the cross and measure the time it takes for the liquid to go cloudy enough so we can't see the cross. We measure the time using stopwatches. We will do this 3 times each for the concentrations of 0mol, 0.5mol, 1mol, 1.5mol and 2mol. We will then collect the results into a results table and draw a graph. Results table: 3 Experiments (seconds) Average Concentration (moles) Pretest 1 2 3 (Seconds) 0 ...... ...... ...... ...... ...... 0.5 35.7 41 40 40.6 40.5 1 31.7 32.4 31.4 35.4 33.1 1.5 30.4 34.1 36.2 30.8 33.7 2 29.3 31.4 30.8 31.5 31.2 Analysis: In my experiment I used a concentration of 0 and from my results you can see that I didn't get any results for this because if the concentration is very low or 0 then its going to take an infinite amount of time to react if the concentration is very high then its going to react very quickly but it will always take an finite time no matter what the concentration is. ...read more.

Conclusion

is a anomalous result, 1 out of the 3 tests done was correct so there was a third of a chance it coming out correct making it into the curved line of best fit. I think our method was good and was probably not the cause of the anomalous result, but may be somewhere extra sodium thiosulphate was added by accident. To make the test fairer I could also try to keep the temperature constant. Also whoever timed the experiment could have gone a few seconds out causing the reaction to last longer than it should have. I think that my evidence is sufficient enough to support my results and I feel that my method worked well. To improve the accuracy of the timings I would consider using a light sensor hooked up to a computer, which automatically stops the stopwatch when light intensity decreases after a certain point, in other words when the solution becomes too cloudy it stops the stop watch which means each test is stopped at the same point therefore the accuracy of each test is improved. Amy Wells ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous 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

# Related GCSE Aqueous Chemistry essays

1. ## Why do penguins huddle to keep warm?

Out of the four layers of test tubes only 4 tubes will need the temperature recorded. Thermometers will be used to check the temperature of the 4 selected tubes and at 2.5 minute intervals over the full 30 minutes, the temperature will be recorded for all 4 tubes.

2. ## Investigating the effects of changing the concentration of different solutions on the refractive index ...

Record the distance, r2, travelled by the microscope from where it starts to where it stops this time. Finally remove the solution, just simply place the coin into the watch glass and find out the distance, r3, travelled by the microscope.

1. ## The action of amylase and pectinase in varying amounts when clarifying cloudy apple juice.

They might have been contaminated in someway or the colorimeter may not have be calibrated properly. To improve my experiment I could spend more time on the pilot experiments trying different apple juices. I could also try different temperatures. I could have tried using a stronger amylase solution such as

2. ## Investigating the Effects of Increasing Copper Sulphate Solution Concentrations on the Germination of Cress ...

But it also seems strange that this was the only pot which did dry out in the whole experiment, this may have been because I was at fault and did not put the full amount of solution into the pot at the start, so it would have been quicker to dry out.

1. ## Investigation into the effects of concentration of reactants on the rate of reaction.

Amount and concentration of acid- The acid controls the amount of sulphur produced so if the amount or concentration of the acid changes so could the rate at which the sulphur is produced (and the cross disappears) so the amount and concentration of the acid must be the same for each reaction.

2. ## Rates of Reaction

- Boss - Clamp stand - Stopwatch - Clamp - Measuring cylinder - Top hand balance - Pipettes Safety There are numerous safety regulations that need to be taken into consideration when conducting the experiment to ensure that I am safe and also other pupils around me.

1. ## What effects the rate of a reaction

In this investigation I shall react identical pieces of Magnesium metal with hydrochloric acid of different concentrations and distinguish which concentration makes the metal disappear most rapidly. From this I will be aiming to discover how altering the concentration of a reactant affects how rapid the speed of a reaction is.

2. ## The effects of concentration on reaction rate with sodium thiosulphate

less because the water is neutral and the process of the reaction would be slower. The equation for this reaction is: Hydrochloric + Sodium Sulphur + Sodium + Sulphur + water Acid thiosulphate Chloride dioxide 2hCl (aq) + Na2S2O5 (aq) S (s) + 2NaCL (aq) +SO2 (g) + H2O (l)

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