Finding Out How Much Acid There Is In A Solution

Results         Titre (cm3)         Rough Titre         1st Accurate         second Accurate         3rd Accurate Start Titre         0.00         0.00         0.00         0.00 discontinue Titre         27.15         26.55         26.50         26.45 Titre Result         27.15         26.55         26.50         26.45 Three concordant results, in spite of appearance 0.10cm3 were obtained, I will thereof imagine an average of these 3 results, using the following polity: 1st Accurate + second Accurate + 3rd Accurate         Number of Accurate results 26.55 + 26.50 + 26.45 = 79.5 = 26.50cm3                  3          3 The percentage error of these titres can also be calculated:          Maximum Result ? Minimum Result x light speed = % error Average Result 26.55cm3 ? 26.45cm3 x 100 = 0.40% (2.Sig Figs) 26.50cm3 1). Calculating the Concentration of the cornerstone solution.

        This needs to be through with(p) so that the acid concentration can be worked out. The stronger the alkali the more acid that will be needed to neutralise it, so the strength of the alkali must be known.

A step-by-step method can be used to calculate the concentration of the alkali: Firstly, the number of moles of atomic number 11 anhydrous carbonate needs to be calculated using the following formula: Number of moles of compound =          spate of compound                   Relative molecular mass of Compound          Formula of sodium carbonate anhydrous = Na2CO3 Mass of compound used = 2.



65g Relative Molecular Mass of Na2CO3 = (2x23) + (3x16) + 12 =106g mol-1 2.65g                  = 0.0250 moles of Na2CO3 106g mol-1 The molarity of the Na2CO3 solution must wherefore be calculated: A 250cm3 volumetric flask was used and therefore there was 0.0250 moles of Na2CO3 in 250cm3 of water.

Because the units of molarity are measured in mol.dm-3, then the number of 250cm3 volumetric flasks that make up 1 dm3 must be calculated: 1000 = 4 amounts of 250cm3 in 1 dm3 250 The number of moles of sodium carbonate in 250cm3 is then multiplied by 4 to give the number of moles of sodium carbonate in a dm3.

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