Separating Selected Metal Cations

Chemistry 266 Dominick Armstrong 10/10/2012 Acid-Base Titration Introduction Acid and bases are two important classes of compounds that fight down to form a salt and piss. When mixing acids and bases a precise bill of the base must be added in order to reach the comparability point. At this point, unmatchable reactant has been exactly consumed by the addition of the other reactant. When playacting chemical reactions chemist use a process called titration to determine the equating point of the reaction.Once the equivalence point is known then chemist disregard plantly determine the amount the concentration of the acid and the base. In this test acid-base titration will be used to determine the concentration of HCl at residual when it reacts with the NaOH H+ (aq)+ Cl- (aq) + Na+ (aq) + OH- H2O(l) + Na+ (aq)+ Cl- (aq) Procedure When performing this experiment one must first obtain and wear goggles. Next add 40mL of distilled water to a 100mL beaker, then add 5. 00mL of HCl to the beaker. because obtain 40mL of 0. 1M NaOH.Place the NaOH in a 60mL reagent reservoir and conk out a small amount into a 250mL beaker to live up to the tip. Connect the Ph sensor to the LabQuest and set up the drop counter. Then calibrate the titrant by adjusting the reservoir tip to and letting the NaOH slowly drain into a graduated cylinder until 9 or 1o ml has been recorded. later the LabQuest has been calibrated discard the solution. The assemble the titration apparatus as shown in the watch below. Place the HCl solution onto the magnetic stirrer and slowly titrate the NaOH into the solution.Start the entropy collection to calculate the volume of NaOH is added when the solution reaches its equivalence point. Then honest down the calculations and disassemble the apparatus. Discussion My lab mathematical group and I stain little this experiment doing two trials. We erect that both trials were concluded with similar results. In trial 1 we demonstrate that the volume of NaOH added to the solution was 4. 01ml before the largest pH increase, and 4. 05mL after. We calculated the volume at the equivalence point to be 4. 03mL. We found there were 4. 310-4 moles of NaOH and 4. 0310-4 moles of HCl. Then we calculated the concentration of the HCl to be . 08 moles per liter. In trial 2 we found 4. 951mL of NaOH was added before the increase and 4. 992mL after. The volume at the equivalence point was 4. 971mL. There were 4. 97110-4 moles of HCl and 4. 97110-4 moles of NaOH. The concentration of HCl was found to be . 094 moles per liter. We found the average concentration to be . 08971M. Although the results of both trial in the experiment were similar the results were non exactly the same.The mistake may have engender from an error in measuring the HCl and distilled water. More HCl may have been added because we did not have an accurate pipet bulb. We used a graduated cylinder to add the HCl, and may have had a more or less HCl than what was needed in the experiment. Conclusion The results of this experiment show that titration is an effective expression to find the concentration of reactants in an acid base reaction. Using the titration helped my group accurately calculate the volume of NaOH that was added to the solution, and helped us to correctly determine the correct concentrations.