Estimation of pH Essay

Acid-base titration calculationsAimThis essay is designed to train our skills of calculation in titration as well as help us to be familiar with the procedures of titration.Background1. Titration is a technique which involves measuring the spate of one solution which just reacts solely with another solution.2. A pipette is designed to deliver exactly the same volume each duration it is used.3. A burette is equipment fitted with a tap and is calibrated so as to accurately measure a variable volume of solution.4. Tire is the volume of the second solution required in titration.MethodThe full experiment is based on computer simulation. To train our calculation skills in titration, two discharges are set. virtuoso is titration between a strong blistering and a strong base. The other is between a indistinct acid and a strong base. In this experiment, the strong acid is HCl, the strong base is NaOH and the weak acid is CH3COOH.Strong acid and strong base1. roofy up the apparatus.2. Measure 25ml Ba(OH)2 by pipette.3. Transfer the Ba(OH)2 into a beaker.4. Add Bromothymol Blue which is and indicator.5. Add HCl into the burette.6. Turn on the pH meter.7. Insert the probes into the beaker.8. Read the reading on burette.9. Start titrating.10. Read the final volume.11. Remove the probes.Weak acid and strong base1. Set up the apparatus.2. Measure 25ml Ba(OH)2 by pipette.3. Transfer the Ba(OH)2 into a beaker.4. Add Bromothymol Blue which is and indicator.5. Add CH3COOHhe burette.6. Turn on the pH meter.7. Insert the probes into the beaker.8. Read the reading on burette.9. Start titrating.10. Read the final volume.11. Remove the probes.Apparatus pipette 25mlBurette 50mlpH meterBeaker 80mlChemicalsBarium Hydroxide, Ba(OH)2Hydrochloric Acid, HClEthanoic Acid, CH3COOHBromothymol BlueSafetyFollow the rules in the laboratory and burst the safety goggles.Set up of apparatusProcedureStrong acid and strong base1. I set up the apparatus.2. I measured 25ml Ba(OH)2 by pipette.3. I transferred the Ba(OH)2 into a beaker.4. I added Bromothymol Blue which is and indicator.5. I added HCl into the burette.6. I turned on the pH meter.7. I inserted the probes into the beaker.8. I read the reading on burette.9. I started titrating.10. I read the final volume.11. I removed the probes.Weak acid and strong base1. Set up the apparatus.2. Measure 25ml Ba(OH)2 by pipette.3. Transfer the Ba(OH)2 into a beaker.4. Add Bromothymol Blue which is and indicator.5. Add CH3COOHhe burette.6. Turn on the pH meter.7. Insert the probes into the beaker.8. Read the reading on burette.9. Start titrating.10. Read the final volume.11. Remove the probes.selective information collectionStrong acid and strong baseInitial pH in the beaker15.03 last-place pH in the beaker2.79Volume of HCl added41.02mlWeak acid and strong baseInitial pH in the beaker14.90Final pH in the beaker2.57Volume of HCl added38.60mlData processingStrong acid and strong baseThe chemic equation for this reaction2HCl(aq) + Ba(OH)2(aq) BaCl2(aq) + 2H2O(l)Weak acid and strong baseThe chemical equation for this reaction2 CH3COOH (aq) + Ba(OH)2(aq) (CH3COOH)2Ba (aq) + 2H2O(l)GraphStrong acid and strong baseScreenshot of the softwareGraph of the pH in the beaker against volume addedWeak acid and strong baseScreenshot of the softwareGraph of the pH in the beaker against volume added endingThe concentration of hydrochloric acid in the first trial isThe concentration of ethanoic acid in the second trial isEvaluation and improvement1. As what I have discovered, all the graphs of a certain reaction in this software are the same. There is no difference in the graph if the concentration is changed. Also the graph is distinct points rather than a curve. During the experiment, sometimes failure occurred. Thus the only improvement could be make is to change another software.