Planning Exercise: Prove sulphuric acid is dibasic

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Bernadette Walsh

April 2008

Planning Exercise

You are required to plan two different experiments that would enable you to prove that sulphuric acid is dibasic.

One of your experiments should involve a titration and the other should involve collection of a gas.

Your planning must be based on the assumption that you are provided with the following:

-Aqueous sulphuric acid of concentration 1.00 moldm-3

-Any chemicals (other than sulphuric acid) and equipment that you require from your school/college laboratory.

Your plan should include the following:

  • Relevant chemical knowledge and understanding from the as part of your chemistry course, including balanced equations;
  • Detailed procedures that provide full instructions about how to obtain accurate results;
  • A diagram of the apparatus used in the gas collection experiment
  • Suitable quantities of chemicals to use in both of your experiments and calculations to show how you worked out these quantities;
  • A specimen calculation to show how the basicity of sulphuric acid would be worked out from the titration data
  • A hazard and a safety precaution for the use of the sulphuric acid provided

All quotations direct from the work of others should be acknowledged by quotation marks, with page references and the sources should be included in the bibiliography.


The aim of this experiment is to demonstrate that sulphuric acid, H2SO4, is dibasic.

Scientific Knowledge:

Sulphuric acid, H2SO4, is a dibasic (diprotic) acid. This means that one mole of sulphuric acid can release two moles of hydrogen ions, H+, when it reacts in aqueous solution.

The reaction of sulphuric acid with sodium hydroxide solution forms sodium sulphate solution, in which both of the acidic hydrogen’s react with hydroxide ions.

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2NaOH(aq)  +  H2SO4(aq)  -->  Na2SO4(aq)  +  2H2O(l) 

Method (a): by measurement of the gas


-the quantities of chemicals you would use and calculations to show how you decided these quantities.

  1. Set up apparatus as shown below.  

  1. Weigh strontium metal
  2. Place 889
  3. Record the final volume of gas produced when reaction has occurred thoroughly (when no more bubbles are being produced).

Cant go over 100cm, gas syringe only holds 100 cm

60cm h2 gas -- 24 litres

Moles of gas

Moles of strontium


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