Chem 112

audition 2 Acetic Acid Content of acetum By Kelsey Huber Chem 112L-01-George Gachumi September 19, 2011 Lab partners Danielle Antes, Alex Ogren, Vanessa Kellems In this experiment acetic unpleasant will be titrated with atomic number 11 hydroxide. As the sodium hydroxide is titrated into the acetic dot it is measu vehement by pH. The sodium hydroxide is added into the acetic root word in small increments employ a buret. The concentration of acetic acid averages at 0. 91. 5M and the known value of the acetic acid is 0. 833M.The percent error of the experiment averages at 0. 66%. Possible errors could include incorrect measurings of sodium hydroxide and/or acetic acid. Background Titration is when one solving is tardily added to another solution so that the response between the two can be accurately recorded or measured. For example, when a base is slowly added to an acid the compare superlative should be neutral. Methods of titration atomic number 18 even used in the f ood persistence to express the oil and fat contents in different products.For example, titration is used in the cheese and the booze business to test if the product is ready for consumption. routine Hirko, R. Chemistry 112L General Chemistry I Laboratory, fifth ed. bluedoor Eden Prairie, MN, 2011 Experiment 2. Results Graph A. 1 shows the flash derivative used to find the volume of NaOH to comparing point which equals 8. 02 ml. Graph A. 2 shows the titration curve of the pH versus the volume of the solution. Graph A. 1 Graph A. 2Discussion The titration of sodium hydroxide to acetic acid eventually produced a dark pink solution. The equivalence point of this solution is a weak acid. The acetic acid yard of commercial vinegar varied slightly in the three trials. In trial one the vinegar molarity was 0. 173 M, in trial two it was 1. 061 M, and in trial three it was 1. 322 M. The concentration of acetic acid was calculated at 0. 91. 5 M, by taking the average of three trials. Th is is within 0. 067 M of the known value which is 0. 833 M.By inspection of the titration curves there could be a difference based on the carry amount of sodium hydroxide being dropped from the burette into the acetic acid solution. At the equivalence point the pH is not seven because acetic acid is a weak acid and it is being conglomerate with a stiff base, sodium hydroxide. The forefinger saturnine red when it reached the equivalence point. Phenolphthalein was a bully indicator for the titration of a weak acid with a strong base because it was the solution that caused the red color as the sodium hydroxide and acetic acid reached an equivalence point.Phenolphthalein would however not be a good indicator for titration of a weak base with a strong acid because the phenolphthalein reacted with the sodium hydroxide to force the red color it was not turning red as a closure of the acetic acid. Inaccuracies in the determined concentration of sodium hydroxide to acetic acid can be attributed to possible measurement errors. Inaccurate measurements while adding the sodium hydroxide from the burette into the acetic acid throughout the three trials could result in various outcomes on the graphs effecting results such as the equivalence point and the titration curve.