CHEMISTRY II.docx(miguel2).docx - CHEMISTRY II Chemistry...

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CHEMISTRYIIChemistry Lab Report
Name: Miguel Paolo Alvaro PamfiloBatch: FBSD1 1803ADate: 26/12/18Lecturers name: Miss ArunaaFin number: G6047295kCourse name: International Foundation Diploma In Biomedical SciencesContents Page
Experiments ObjectivesExperiment 1
The objective of this experiment is to use the end-point of the titrationto figure out the pKa of the ethanoic acid by titrating a weak organicacid to a strong base.Experiment 2The objective of this experiment is to find which acid has the greatertendency to lose hydrogen ions which would then be the strongeracid.HypothesisThe purpose of this experiments was to test a strong base with a weakacid buffer and a strong acid with a weak base buffer. To comparewhich is the stronger acid using the end point from the titrationresults. It has been figured out that a buffer helps maintain a nearconstant pH upon addition of small amounts of H+or OH-ions to asolution. It has a tendency to resist huge changes in the pH of thesolution.Anacid is a substance that produces hydrogen ions in waterwhile abase is a substance that produces hydroxide ionsin water.A weak acid or base is a substance that areonly partially ionized in water. Water is used as it is auniversal solvent and is self-ionized hence it isinsignificant in the chemical equation of the solution.Therefore, it was hypothesized that Tris base is thestronger acid as a weak acid such is ethanoic acidwhich have a higher pH compared to the end productTris acid.Background Research
Titration is the process of addinga standard acid, from a burette, to abase. This type of titration is known as acidimetry and is used in Part2 of the experiment. (DASH, 2017) The reverse of this processinvolves the addition of a standard base which is in a burette into abeaker with a known volume of acid. This type of titration is knownas alkalimetry. (DASH, 2017)A potentiometric titration is a type of titration where the end isdetermined by measuring the change in the potential of the electrodeused to measure the concentration during the titration (Gadag, 2014).In this case, the electrode refers to the pH meter electrode thatmeasures the concentration of hydrogen ions (H+) that is present in thesolution.A pH meter is a specialized voltmeter that measures the pH of asolution directly. It must be calibrated using a buffer of a known pHso that the readings from the experiment is more precise. Theelectrode is delicate and must be fully immersed into the solution foran accurate reading of pH. When there is change of solutions andstarting on different titrations, the electrode bulb must be washed withdistilled water and placed back into the buffer. (MDIS, 2014)Part 1 of the experiment involves the reaction of sodium hydroxidewith ethanoic acid. The equation for the reaction is as seen below:CH3COOH + Na+OH-CH3COO-Na++ H2OAs soon as sodium hydroxide reacted with ethanoic acid, it forms aproduct that is a mixture of the acid and its conjugate base which is

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Term
Spring
Professor
N/A
Tags
Chemistry, RNA, pH, buffer solution, Tris

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