LABORATORY EXERCISE 1 Objective Evaluation of Foods By Jessa Mae L. Cubero Ana Rica S. Navarra Abegail Nicca S. Oafallas Submitted On 9 December 2008 TABLE OF CONTENTS Introduction……….3 An overview on Food Evaluation 3 The Importance of Evaluation and Analysis on Food Science 3
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Billy Kong Chem&163 Lab Report 1 Analysis of Acids‚ Bases‚ pH and Salt Purpose: Explore various methods for determining the characteristics of acid/base solution. The goal of this experiment include the investigation of various acid/base indicators‚ calculating the change of pH with concentration‚ change of pH due to the addition of salt and different between strong and weak acids/bases. Safety and Disposal: Use extreme caution when handling concentrated acids and bases. Dispose of all
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Introduction to Chemistry Laboratory: A Lesson on Tools‚ Techniques and Measurements PURPOSE: The purpose of this set of experiments (3 total) is to become familiar with the common types of laboratory glassware and equipment‚ and how to obtain and analyze data from these items. LEARNING OBJECTIVES: By the end of this experiment‚ the student should be able to demonstrate the following proficiencies: 1. Know which glassware (beakers‚ burettes‚ pipettes‚ graduated cylinders‚ flasks‚ etc) should
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this titration will be KHP (C4H5KO4). Phenolphthalein we be added to the beaker of the dissolved acid before the titration will be added. The titration will stop when the solution turns pink and the color doesn’t go away. Procedure: The procedure is stated in my notebook Data/Observations: Observations of all trials | * The solid KHP dissolved in distilled water * The Solution turned stayed pink after enough KOH was added to the dissolved KHP. | Trial 1: 1.5316g KHP 50.000 mL KOH in burette
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SAFETY General WHMIS beforehand – no messing around on anything‚ no food/drink anywhere PPE – goggles‚ coat‚ feet Treatment Skin Chem: emergency shower – TA/HS Eye Chem: eye wash – 10 mins. TA/HS Fire Emergency kill switch for gas‚ electricity and water – leave and set the alarm Stop drop and roll Apparati should be clear of any controls or switches‚ keep vapours to minimum/take need Extinguishers – on the wall inside each 1st year lab Class A - ordinary combustibles
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Using a clean plastic weighing dish‚ obtain between 1.50 g of potassium hydrogen phthalate ( C8H5KO4) to a 125 Erlenmeyer flask and add about 50 mL of water. Swirl the flask to dissolve the KHP. Record the exact mass of KHP that you use. 6. Transfer all of the KHP to a very clean Erlenmeyer flask along with approximately 50 ml of deionized water. Squirt some
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CHEMISTRY 1184 Laboratory Manual for GENERAL CHEMISTRY I Jim Carroll Roger Hoburg Dana Richter-Egger August 2006 University of Nebraska at Omaha i Table of Contents Table of Contents ......................................................................................................................................... i Chem1184 SYLLABUS............................................................................................................................... ii Preliminary
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following: (i) a pure liquid with an extremely low surface tension Answer: any molecule with low interatomic/intermolecular interactions Examples include – liquid He‚ Li‚ H2‚ (ii) a strong Lewis base Answer: Any Group I or Group II hydroxide e.g.‚ LiOH‚ NaOH‚ KOH‚ Ca(OH)2 (iii) a pure substance which can be melted by reducing pressure at a given temperature Answer – Almost any compound but water; examples include sulfur‚ N2‚ phosphorus‚ CO2 (iv) an important colligative property of solutions Answer:
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Oxidation Reduction Titrations: The Indirect Iodimetric Analysis Ascorbic Acid Unknown Number 69 I: Purpose: To determine the percent weight of Ascorbic Acid in unknown sample. This was to be done by the means of an indirect iodimetric analysis. In an iodometric analysis‚ the oxidizing agent can be determined by a different means than titrating directly with standard iodide‚ because a high concentration of I- is needed to form the I3- complex. In this type of analysis‚ excess iodide is added to
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李嘉雯 (Chinese) Group no.: 1 Class: AS114103/A1 Date: 24/5/2013 Assignment 1 –Tutorial Questions on Chemical Oxygen Demand (COD) Experiment 1. What is the function of using KHP in the COD test? (2 marks) KHP is used as a control standard because KHP is stable pure organic compounds which have the theoretical value of COD(500ppm)‚ so it can used to gain an idea of how accurate the lab was. 2. Calculate the theoretical oxygen demands(g oxygen/g compound)
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