Finding out How much Acid there is in a Solution.

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Finding out How much Acid there is in a Solution.

PLAN:

            The purpose of this experiment is to obtain an accurate concentration of sulphuric acid, that is found in solution. We are told that the sulphuric acid to be used has a concentration between 0.05 and 0.15 mol dm , but the task is to clarify the exact concentration using the method of titration. We are also provided with solid, anhydrous sodium carbonate and a range of indicators. From reliable sources that were issued to us, I have been able to determine which of the various indicators given to us that I will use in this titration. I have chosen to work with methyl orange, due to the fact that the titration to be carried out is between sulphuric acid (strong acid) and sodium carbonate (weak alkali). Methyl orange is the indicator to be used, as it is the only one that will work for a strong acid and a weak alkali.

        To begin with I will have to prepare a standard solution of sodium carbonate that will be used in the titration with sulphuric acid. The sodium carbonate is of known strength and volume in contrast with the unknown concentration of sulphuric acid.

        This is the equation for the titration:

H SO  (aq)  +  NaCO  (aq)  --  Na SO  (aq)  +  H O (l)  +  CO  (g)

Preparing a standard solution:

        These are the requirements, showing apparatus and the quantities of the materials to be used.

Requirements:

  • safety glasses
  • spatula
  • weighing boat
  • anhydrous sodium carbonate, 2.54g
  • balance weighing to within 0.01g
  • beaker, 250cm
  • wash bottle of distilled water
  • stirring rod
  • volumetric flask, 250cm ,with label
  • filter funnel
  • dropping pipette
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Here is the procedure which is required for preparing my standard solution.

Procedure:

1: Using a spatula transfer 2.54g of sodium carbonate to the weighing boat. Weigh the sodium carbonate and weighing boat in the balance, and make sure that you have exactly 2.54g of sodium carbonate, weighing to the nearest 0.01g.

2: Put about 50cm of distilled water into a 250cm beaker. Carefully transfer the bulk of the sodium carbonate from the weighing boat into the beaker.

3: Reweigh the bottle with any remaining sodium carbonate to the nearest 0.01g.

4: Stir to dissolve the solid using ...

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