Investigation into the dibasicty of sulphuric acid

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WTFCOURSEWORKINGO        Candidate Number: 5621         Centre Number: 12828

OCR (2812/03/PLAN)
Practical Examination 1 (Part A – Planning Exercise)

Aim
The aim is to prove that Sulphuric acid is a dibasic (diprotic) acid. Dibasic (diprotic) means that the acid in this instance H2SO4 contains two hydrogen atoms that can be ionized  [http://www.thefreedictionary.com/dibasic]

Experiments
In order to prove its dibasicity I have to plan out two different methods, the first will include gas collection as the other will be a titration

Hazard and safety precaution

H
2SO4 is very corrosive and can burn the skin therefore I shall wear gloves when handling the concentrated acid, also incase there is any spillage of the acid I shall clean it up with plenty of water or I shall use a weak alkali to neutralise the acid.

Gas Collection
The first experiment that I will be doing will be a gas collection I will be reacting magnesium with a monobasic acid (hydrochloric acid) and a dibasic acid (sulphuric acid), and will be measuring the amount of H
2 gas being produced. To do this experiment I will need to use the apparatus shown in the picture below.

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Note the tubing is to allow the contents of the ignition tube to come out and react with the sulphuric acid.

 

The chemical equation for this reaction is
Mg + H
2SO4  MgSO4 + H2

From this reaction I will be measuring the amount of H2 that is being produced, I expect that to be around 70cm3 seeing as the gas syringe can hold up to 100cm3. To calculate how many moles of hydrogen I have collected I must use the rule that any gas is 24dm3

Firstly I must convert the cm3  dm3 by dividing 70 by 1000


70 ÷ 1000 = 0.07dm
3

Secondly ...

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