Titration

As the titration of the two different vinegars were completed by different people, the techniques we used may be different therefore the results may be different than if it was completed by the same person. The experimenter may have misread equipment such as the…

It is important to note that the goal of this experiment was to find the pKa value of bromothymol blue, a pH indicator commonly used in titrations. [UNC, 2017] The pKa is where the number of moles of acid to conjugated base are equivalent. To find this, both Beer’s Law and spectroscopy were utilized in an attempt to make graphs to show just where this value occurred. According to Sigma-Aldrich, the pKa of bromothymol blue is approximately 7.10. [SIGMA, 2017] The final pKa found experimental was…

completely, meaning that only some of the H+ ions will be lost. A strong acid will however, will release more of their H+ ions (Tro, 664). This concept is similar for bases; when strong, a base will dissociate more fully, whereas a weak base will not. Titration is a process used to identify an unknown amount of an acid or base in a solution. This is done…

Danika Ng CHEM 1252 L Exp 12: Thermodynamic Analysis of Chemical Equilibria INTRODUCTION The reaction being done with borax and HCl is an acid base reaction. The K constant expression of the reaction is Kc = [Na^+][B4O7^-2]. A titration is needed for this experiment because when a strong acid with a known concentration is added to a weak base, the unknown concentration of the weak base can be found, which can then find the moles of the weak base, which can then find the Kc. The first law of…

IV. METHODOLOGY SAPONIFICATION VALUE Saponification is a method used in treating a neutral fat with alkali, breaking it down to glycerol and fatty acids. The saponification value or saponification number is the amount of alkali needed to saponify the given quantity of fat or oil, expressed as mg potassium hydroxide to saponify 1 g of the sample. In this experiment, the researchers used chemicals such as ethanol, hydrochloric acid (HCl), potassium hydroxide (KOH) and phenolphthalein indicator.…

neutralized solution was titrated with 0.1M NaOH till the end point was reached. The volume of 0.1M NaOH used in the final titration was used to calculate DM as follows: DM(%)=(Normality of alkali*Volume of alkali (mL)*31*100)/(mass of sample (mg)) Where normality of alkali was 0.1N, 31represent molar mass of methoxyl group, and volume of alkali is the final volume of NaOH used in the titration. GalA content was calculated according to the formula below:…

The list of errors start from the beginning of the experiment. Although the numbers seem to be close to the actual values, there is still room for error with the numbers. What the class noticed first is that we could have been working with very impure benzoic acid. The benzoic acid we were given was made by the 102 chemistry students, meaning that it wasn’t properly made. Students have said that they were rushed and weren’t able to take their time to filter the solid out of the solution. We had…

measuring 8.3 milliliters of the chemical. Then, pour the chemical in a beaker and fill the beaker with 250 milliliters of distilled water. This will give the students 1 mole of hydrochloric acid ad 1 mole of sodium hydroxide. When it comes to the titration, the students first have to clean the burette with distilled water. Then, the burette is…

Introduction: Kidney stones are an extremely basic urinary issue. Also known as renal calculi, kidney stones are characterized by their high occurrence and a high repeat rate. This issue results from the arrangement of insoluble salt stores in the urinary tract and inside the kidney. The rate of this issue has expanded in the course of recent years for reasons that are not entirely known, but have caught the consideration of numerous scientists. There are different types of kidney stones, each…

distilled water were placed into the flask. The solution was stirred until all of the oxalic acid crystals were dissolved. One drop of phenolphthalein indicator was then added to the 250 mL Erlenmeyer flask. The flask was placed under the buret and the titration began. Turning the stopcock drops of the NaOH solution began to drop into the oxalic acid and phenolphthalein indicator solution. Once neutralization was reached the oxalic acid and phenolphthalein indicator solution turned pink and the…