For the following lab, the purpose is to utilize titration to determine the amount of ascorbic acid (vitamin C) present in a substance by reacting it with potassium bromate. An oxidation reaction takes place with ascorbic acid to produce dehydroascorbic acid, using an excess of bromine. The total amount of bromine utilized during the experiment is determined utilizing a back titration, in which the bromine is reacted with bromate. One mole of bromate produces three moles of bromine and the…
the acid detergent fibre which is a measurement of lingin, cellulose and lignified nitrogen is 306.79 (g/kg DM). The neutral detergent fibre of the silage was 552.40(g/kg DM) and is an indicator of forage intake potential which declines as NDF value increases. The pH value of the silage is 3.91 and its an indicator of the acid in the silage.…
At 20 seconds, pH = 7.35 2. At 40 seconds, pH = 7.29 3. At 60 seconds, pH = 7.24 4. Did the pH level of the blood change at all during this run? If so, how? Yes, the pH level of the blood decreased. 5. Was the pH level always within the “normal” range for the human body? If not, when was the pH value outside of the normal range, and what acid/base imbalance did this pH value indicate? No, acidosis occurred at 40 seconds when the pH dropped out of “normal” range to…
Titrations II: Potentiometric and Indicator Titrations Introduction- In this experiment, the reactions of three different acids with a strong base are studied by observing how the pH of the solution changes as the titrant is added. A plot of pH versus amount of titrant added will be constructed. Such a curve is called a pH titration curve. The equivalence point of the reaction will be determined from an analysis of the pH titration curve, and by the use of acid-base indicators. The pH…
approximate concentration of 2.5 M against sodium carbonate solution. The main steps of this experiment were preparing the sodium carbonate solution, transferring the solution into a conical flask by using a pipette, adding the bromophenol blue indicator and titrating with hydrochloric acid until the first green colour appeared. The concentration of hydrochloric acid was found to be 0.2508 mol L-1. Introduction Standardisation is a process which is carried out to determine the actual molarity of…
In this case methyl orange can be used as the indicator, pH arc being 3,1...4,4, or methyl red, pH arc being 4,4...6,2. If the pH value is bigger than the arc then the indicators will give a yellow colour to the solution, if smaller then a red colour. Total hardness is the sum of amount of Ca2+ and Mg2+ ions and is determined via complex-titration. Here is the stoichiometric point found by using different complex ions with different colours. The solution is titrated with…
both discarded into the waste bin and rinsed three times to prepare for the next trial. The same process was used to obtain the 50 mL of NaOH as in the previous experiment, but Ba(OH)2Ba(OH)2 was used instead. HCl was added to the phenolphthalein indicator and deionized water as in the first trial. 4 mL was added quickly and a singular drop was added slowly from there. A reaction took place at exactly 6 mL which was what was predicted. A light pink solution was produced. The second trial went…
DISCUSSSIONNN ————————— 1+2.) The results gathered showed that compound A had two spots, lower spot had an rf value of 0.48 and upper spot had an rf value of 0.77, this shows that compound A contained both paracetamol which has an rf value of 0.48 and caffeine which has an rf value of 0.77. Compound B had an rf value of 0.77 which is the same as caffeine therefore compound B contained caffeine. Compound C had an rf value of 0.48 which is the same as paracetamol therefore compound C contained…
Ali Youssef CHM 111-0A7L Mitra Jahangeri Paper Chromatography Lab Discussion The results of the Paper Chromatography process seem to have aligned with what was expected. When the capillary action on the paper had completed and the chromatograph was finished, the distance that each cation moved (D), as well as the distance that the solvent moved (L), could be properly measured. The distance that the solvent moved ended up being 7.05cm, a number that would represent the constant variable L in…
Lab 14/ Test 6: Determination of Acid Dissociation Constants through Titration Sabrina Tom I.Abstract The two unknown solutions A and E were titrated with NaOH solutions. For each solution, one fast and three slow titrations were done to see where the pH rose exponentially. The unknown solutions A and E were determined to be Pyridinium ion acid and oxalic acid, respectively. II.Theories One significant concept throughout this lab is titrations. A titration is a lab method analyzes a…