Investigation of the suitability of indicators and instrumental detection

Feb 3rd, 2012
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Ashford University
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In the titration of strong acid-weak base, ammonium hydroxide was added into hydrochloric acid with phenolphthalein as first indicator. When 3 drops of phenolphthalein added into hydrochloric acid, no colour changes in the colourless solution. Ammonium hydroxide was then being added slowly into hydrochloric acid and the solution was stirred at a constant speed.

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?TitleInvestigation of the suitability of indicators and instrumental detection of equivalence points in acid-base titration. Objective1. To understand the importance of choosing suitable indicators for detecting the end points of acid-base titrations. 2. To obtain titration curves for some acid-base titrations. Materials and Method(Please refer to the General Chemistry BPH2012 practical manual pg 4-5)ResultsPart I: Suitability of IndicatorsA.Strong acid-weak base titration12Initial Burette Reading (mL)19.5017.00Final Burette Reading(mL)50.0047.30NH4OHused(mL)30.5030.30Average Titre Volume (mL)Table 1.1: Volume of 0.1M of NH4OH used to titrate 25mL of 0.1M of HCl using phenolphthalein as indicator.12Initial Burette Reading (mL)25.0018.50Final Burette Reading (mL)49.8043.50NH4OH used (mL)24.8025.00Average Titre Volume (mL)Table 1.2 : Volume of 0.1M of NH4OH used to titrate 25mL of 0.1M of HCl using screened methyl orange as indicator.B. Weak acid-strong base titration12Initial Burette Reading (mL)15.1013.30Final Burette Reading (mL)40.3038.70NaOH used (mL)25.2025.40Average Titre Volume (mL)Table 2.1: Volume of 0.1M of NaOH used to titrate 25mL of 0.1M of acetic acid with phenolphthalein as indicator.12Initial Burette Reading (mL)12.8015.30Final Burette Reading (mL)15.3017.60NaOH used (mL)2.502.30Average Titre Volume (mL)Table 2.2: Volume of 0.1M of NaOH used to titrate 25mL of 0.1M of acetic acid with scre

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