titration (1) (1) (2).docx - Dan Obi-Imegwu October 18,...

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Dan Obi-Imegwu October 18, 2018Chem 1008 General chemistry IIGroup: Nick Tarik Lab 5: PH-Titration
Abstract: Titration is described as the process of determining enumerative addition of a certain amount of solution of a known concentration with a certain amount of solution of an Unknown concentration. When conducting this titration experiment there was an Acid-base relationship involved. An acid-base titration is the process of determining the concentration of an acid or base. The titration of an acid involving a base demands that the PH of the two concentrations be monitored by a Spark Vue. The base in the experiment was Standard NaOH solution and the acidwas an Unknown weak acid. In titration an indicator is added to the Unknown weak acid-base reaction to assess the PH this indicator is called Phenolphthalein. The indicator is colorless in acid and pinkish purple in base. When Phenolphthalein changes from colorless to pinkish purple it is estimated that it ha reached its end point. This experiment focuses on showing the relationship of acid-base reactant and PH titration. The experiment was conducted to determine the concentration of the weak acid. Using equation from titration data to find the PKa which was 7.18 and 8.268 to determine the concentration of the weak acid. The equivalence point of a weak acid and a strong base shows titration is at an alkaline pH. When the moles of acid and the moles of base are equivalent at the middle of the S curve the concentration of the Unknown weak can be found. In PH titration there are three areas of concern the starting PH the steepest PH change and the constant PH these areas form the s curve on the graph. Introduction:The German Chemist Friedrich Mohrn in 1855 defined titration as the weighing without scale method. This method allows the determination of the concentration of a sample without using complex equipment. A hand operated titration entails high accuracy and precision. The French also contributed to helping better evolve the development of quantitative chemical analysis.A buret for pipetting was first prepared by a French chemist known by Francois Antoine Henri Descroizilles in 1791. The Burets then been a bit more modified for better accuracy by another French chemist Known as Joseph Louis Gay Lussac in 1824. This consist of the new burets that also included a side arm. The preparation of the material and the use of different reactants must both be precise or will throw off the experiment. The experiment must be done at least twice must consist of a trial run and a careful run. If the experiment is slightly off another careful run can done to get reliable values.

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Term
Fall
Professor
Pheobe Zito
Tags
Chemistry, pH, Unknown HCl

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