Finding out how much Acid there is in a Solution and the Molarity of acid through titration.

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Finding out how much Acid there is in a Solution and the Molarity of acid through titration.

Edward Hayden

Barton Peveril College

The aim of this investigation is to find out the morality of a sulphuric acid solution between 0.5 and 1.5 mol/dm3; the means of finding out is through titration.

Apparatus needed are as follows:

25cm3 Pipette, burette, 250cm3 conical flask, 250cm3 beaker, stand, grip clamp, scales

For each repeat experiment the following will be needed:

50cm3 of sulphuric acid, 25cm3 of 0.1mol Sodium Carbonate solution made from distilled water and 2.65g of solid anhydrous sodium carbonate, 2-3 drops methyl orange.

First weigh a small piece of paper and record the result, then add this mass to the amount needed of sodium carbonate, in this case 2.65g. Add the amount needed of sodium carbonate to reach the total of paper and substance. Then dissolve this amount of sodium carbonate in distilled water until the solution reaches 250cm3. This makes 0.1m sodium carbonate solution. The equation shows that one mol of H2SO4 and one mol of NACO3 reacts to give one mol of sodium sulphate, one mol of water and one mol of carbon dioxide. We know the acid solution is between 0.05 and 0.15mol/dm3 therefore by making 0.1mol/dm3 solution the amount of each substance will be similar and not an excess of one is needed over the other. Below shows the working needed to calculate the amount of solid anhydrous sodium carbonate needed in order to obtain the required 0.1mol/dm3 solution.

Relative molecular mass of NaCO3 = 106g

To make 1m solution 106g of the substance would need to be dissolved in 1000cm3 of distilled water.

To make a 0.1m solution 1/10 of 106g this would need to be dissolved in 1000cm3 of distilled water, this is 10.6g.

Therefore to make a 0.1mol/dm3 solution in 250cm3 of distilled water we need 25% of 10.6g, as 250 is 25% of 1000. The amount needed is therefore 2.65g of solid anhydrous sodium carbonate.

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Measure out 25cm3 of 0.1mol/dm3 sodium carbonate solution using a 25cm3 pipette and pour into a 250cm3 conical flask. Fill the burette with 50cm3 of sulphuric acid so that the level reads 0 at the top of the burette. Ensure both the chamber at the bottom of the burette has been run through with acid as air bubbles can occur, and that the valve is closed so no acid escapes. Clamp the burette to the stand but make certain the tip of the burette is just slightly lower than the height of the conical flask. Add 2-3 drops of methyl orange to the ...

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