Titration

Purpose Titration is a technique where an unknown solution’s concentration is determined with a solution of a known concentration. In this case, the known solution, NaOH, is dripped into the unknown, unknown #2, with a burette. The NaOH is dripped until the reaction is complete, while measuring the pH per amount of base added. Using the data collected, the equivalence point can be found and the concentration can be calculated. Then the KA can be found at specific points (20%, 40%, etc). After…

Josie Nadaud CHM 144L-A Professor Jessa/TA Jess October 8, 2015 Experiment 5 Partial Formal Report Methods 1. Traditional titration with indicator dye (week one) First the 50mL buret was cleaned by filling it with distilled water and letting it empty three separate times. It was further cleaned by coating the inside with 5 to 10 mL of the 0.0468M NaOH titrant solution and emptying that into the waste beaker as well for three repetitions. 40.0 mL of 7-Up soda was diluted with 60.0 mL of…

DETERMINATION OF pKa AND pKb USING ACID-BASE TITRATIONS Introduction Acid-base titrations can be used to determine pKa of a weak acid and pKb of a base. A weak acid and a weak base incompletely dissociate in water. For this reason, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) depend on equilibrium coefficients of acid (Ka) and base (Kb). Equation 1 shows the chemical dissociation equation of a weak acid. Furthermore, Equation 2 describes the equilibrium constant of a weak…

Task 3: Explain standard solutions and at least 3 different types of titrations that are used in industry and compare these to titrations in the lab. Standard Solutions & Titrations A standard solution is a solution of a known concentration. Standard solutions are made by dissolving an accurately weighed mass of a solid in a known volume of a soluble solvent using a volumetric flask. Method • Firstly, you would need to calculate the mass of the NaOH that you are going use. • Next you…

01087M ± 5x10-5 Average Volume used: 15.62 mL ± 0.04 mL Discussion: The lab took four trials because when the titration was finished, the second, third, and fourth volumes agreed to ± 0.2 mL. Some observations that were made was that after adding 0.2 grams of KI, 1mL of 1M sulfuric acid, and 10.00 mL of vitamin C that the solution resulted in a dark orange color.2 Continuing titration, the solution turned into a pale yellow color. Addition of 5 drops of starch solution, reactions occurred…

volume until specific pH allow us to know how much volume is required to reach the endpoint. •Visual identification from titration curve; the data are recorded after that small volume are added from buret until endpoint. Then graph pH vs volume added lets us know the volume consumed of titrant and then the alkalinity can be calculate. •Numerical differentiation of the titration data that method is performed by plotting ∆E/∆V vs the volume of acid added. A maximum in the plot corresponds to the…

Uranium and its decay products can be found in the environment through a wide array of anthropogenic activities such as mining, nuclear and power generation industries and the production of phosphate fertilizers .(Sprynskyy et al. 2011) They pose a severe, long term ecological and public health threat (Khani 2011, Landa 2003) and therefore there is a considerable effort in the removal of these pollutants before their final discharge in the environment, as well as their recovery as an energy…

hydroxide (NaOH), which is a strong base. By using the back titration technique, the amount…

sample. I tested three different samples containing different percentage amounts of ethanol in them; Listerine, Terra Fresca Wine and the last is a mixture of ethanol and water that was made by me. The three different methods compared are the redox titration method which involves the oxidation of ethanol to ethanoic acid and then titrating the residue with sodium thiosulfate, which would then be used to calculate the number of moles of ethanol present in the original sample. The method of…

two of NaOH can sneak out before the valve is closed. Those few missed drops as well as excess NaOH in titration can affect the accuracy of the results. Human error is almost always a factor for example when measuring any values without digital assistance leaves room for the naked eye to make mistakes. As far as the second part of the experiment was, the 0.0025% deviation indicates that the titration was accurate. The ending molar mass (202.59 g/mol) of the mystery acid points to two…