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Finding out how much acid there is in a solution

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Introduction

Finding out how much acid there is in a solution. Aim: The aim of my experiment will be to find the accurate concentration of the sulphuric acid. Plan: I am going to be set a sample of sulphuric acid solution. The solution is considered to have the concentration between 0.05 and 0.15mol dm-3. I have to find a precise concentration of the solution. To perform my experiment I will be using: o A funnel o A volumetric flask o A burette o A graduated pipette o A 250cm3 beaker o A conical flask o A burette clamp stand o A retort stand o A white tile o A piece of white paper o Top pan balance o Distilled water and bottle o Weighing bottle o 2.65g of sodium carbonate dissolved in 250cm3 of distilled water o Methyl orange indicator o Unknown concentration of sulphuric acid o A glass rod o A pipette I will use the 'information sheet on the use of indicators in acid alkali titrations' to work out which indicator would be the best use. I'm using sulphuric acid and this is a strong acid. The other is sodium carbonate with is a weak alkali. So according to the sheet for a titration between a strong acid and a weak alkali, methyl orange is the indicator to use for this experiment. ...read more.

Middle

When I know I have got the correct amount I will then place a plain piece of white paper with a thick black line on, this will ensure that I can see the line and the meniscus clearly line up. I will shake the volumetric flask to make sure the solution is completely mixed together. I will set all of my apparatus and rinse though everything with distilled water before using it, this will reduced contamination from other substances. I will rinse the burette with acid, then using a funnel I will fill up the burette up above the zero mark so then I can run a little of acid through to ensure that the jet is full. By placing a piece of white paper behind it with the line on it like the diagram above, I will be able to record an accurate reading on the burette. Using the graduated pipette, I will measure out 25cm3 of sodium carbonate solution will be transferred to the conical flask, along with five drops of methyl orange indicator. I will then run in the acid from the burette slowly keeping a hand on the tap and swirling the flask at the same time. When the acid comes into contact with the sodium carbonate there will be a pink area in an orange solution. ...read more.

Conclusion

It could too pink or just under and making sure that I get the same colour for each titration. I think that my results are reasonably accurate as a few of them are within the 0.1 range, so this gives less error. There is a very small and almost insignificant percentage error for the glassware. I suppose that the concentration of the sulphuric acid I was given is near to 0.1 as there is a likelihood of a percentage error. Weighing by difference increased the accurateness of and reliability of my results as the percentage error is fewer than if I had not weighed by difference. I washed the glassware with correct solutions as it washes away any traces of substances as these may change my results. Washing down the side of the flask during the titration made certain that all the acid I had run in was gone. Using a white tile could help me recognize the end point of the reaction. The white piece of paper made the meniscus easier to see and take a reading from. I must use the same amount of orange methyl indicator in each titration done, otherwise it would have been an unfair experiment and it would have affected my overall results. ?? ?? ?? ?? Coursework Jess McSevney ...read more.

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