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Investigation 14: How do the structure and the initial conce

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Manuel Sojan

on 10 June 2014

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Transcript of Investigation 14: How do the structure and the initial conce

Investigation 14: Contributing Factors towards the pH of the resulting solution during titration?
Central Challenge
How does the structure and the initial concentration of an acid and base affect the pH of the resultant solution during a titration?
Background Information
Background cont.
Using a pH indicator, one can tell when to stop adding the titrant. Many industries, especially the food industry uses titrations to determine the amount of sugars, fatty acids, and vitamin C or E concentrations.
Many elements in our daily life contain both acids and bases. Some of these include pharmaceuticals, biofuels, aquarium water, foods, etc. The acid and base amounts, as well as the pH can all be maintained.
If a solution becomes to acidic, one can add some base to react with some of the acid. An example of this comes from when hydrochloric acid reacts with sodium hydroxide to produce sodium chloride and water. an equation of this is:
HCl(aq) + NaOH(aq) ---> NaCl(aq) + H2O(l)

1.Procure 0.1M of NaOH and 0.1M of HCl
2. Pour 25ml of HCL and a drop of Phenolphtalein in 200 ml beaker.
3. Fill 50 ml burette with 0.2M NaOH
4. 0.2 of NaOH until pH of 4 is reached, then titrate 1.5 ml until pH of 7 is reached, afterwards titrate 1 ml until pH of 10 is reached, finally titrate , 0.5 ml of NaOH until pH of 12 is reached and stays constant.
5. Repeat procedure, but replace NaOH and HCl with (0.2 NaOH, 0.2 HCL) (0.3 NaOH,0.3 HCL)
0.2 NaOH
0.1 HCl
0.2 HCl
0.1 NaOH
0.3 HCL
0.3 NaOH
50 ml buret
200 ml beaker
Ph Probe
Methyl Orange

0.2 HCl is titrated with 0.2 NaOH
0.1 HCL is titrated with 0.1 NaOH
0.3 HCL is titrated with 0.3 NaOH
We believe that when an acid or base of greater concentration is added during titration the pH of the resulting solution will change in a more dramatic fashion as opposed to having an acid and base at controlled concentrations.

Based on the data we collected our hypothesis was validated, as we decreased the initial concentrations of the acids and bases the titration curve took longer to actually reach the equivalence point. Ph increased gradually when we used the acids and bases that were in higher concentration as opposed to the other acids and bases which increased in pH at a much slower rate. To ameliorate, the resultant ph of each solution also ended up being higher as we used acids and bases of higher concentrations. However, if there are any errors we must accommodate for is the fact that at times readings weren't necessarily 100% accurate due to the fact that we titrated too many milliliters due to the buret.
The Ph of the resultant solution during titration will be affected by whi
ch component are in greater concentration, we believe that the titration curve will reach the equivalence point at a faster rate when acids and bases with higher initial concentrations are used.

Safety Procedure:
Make sure to wear an apron and safety goggles. Make sure to be extra safe with chemicals and notify your teacher for any spills.
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