retain a sample of original sample! This sample/DIW ratio will give ion concentrations of ~0.1-0.2M for soluble salts of unknowns. (ii) Observe pH to one SF Use small portion of sample to make a solution with neutral water to test pH with indicators. ≈2 HSO4- (no OH-) ≈5-6 NH4+ ≈7 Cl-‚ NO3-‚ SO42-‚ Na+‚ K+ ≥13 OH- (iii) Perform necessary separations If Na+ and NH4+ are present‚ testing for K+ requires separation of NH4+. Place small portion of original sample in crucible and
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digestion of lipids in the milk. When lipids are broken down in to fatty acids and glycerol (see below)‚ the acid lowers the pH of the mixture. To help me determine and measure the digestion of lipids‚ a pH indicator phenolphthalein has been used to measure the pH of the mixtures. The pH indicator will change the colour from pink to either white (if bile is not contained) or brown (if bile is contained)‚ this will indicate that the solution is changing from alkaline to acidic. So if I want to use phenolphthalein
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ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY 9647/03 Higher 2 13 September 2010 Paper 3 Free Response 2 hours Candidates answer on separate paper. Additional Materials: Answer paper‚ Graph Paper‚ Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚
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w w ap eP m e tr .X w Paper 3 Practical Test CONFIDENTIAL INSTRUCTIONS 5070/03 May/June 2004 Great care should be taken that any confidential information given does not reach the candidates either directly or indirectly. INSTRUCTIONS TO SUPERVISORS Teachers responsible for the examination are NOT allowed to consult the question paper before the day of the examination. However‚ they are asked to carry out a titration between solutions P and Q‚ to ensure that the concentrations
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a known volume of solution and is a type of volumetric analysis. Many titrations involve either acid-base reactions or oxidation-reduction reactions. In this experiment we do one of each. We monitor the pH of the reaction with the use of a color indicator. We also learn about the standardization of bases (NaOH) and acids (HCl) which is basically making a dilution to change the molarity. The first reaction consists of titrating sodium hydroxide (NaOH) into potassium acid phthalate (KHP or K[HC8H4O4]):
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Table 1. Observations from week 2 for the detection of ammonia using the Nessler’s reagent and from week 1 for the pH using bromothymol blue indicator with the inoculation of P. vulgaris‚ P. fluorescens‚ and B. Cereus in peptone broth. Tubes were incubated at room temperature for 7 days and 14 days. Soil Microorganism Nessler’s Reagent (color reaction pH (bromothymol blue) Our results pH (bromothymol blue) Class results P. vulgaris Deep yellow ++ 8.0 8.0‚ 7.5‚ 6-7‚ 11.5 P. fluorescens
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Title Laboratory Techniques and Measurements Purpose The purpose of this experiment is to determine mass‚ length‚ temperature‚ volume‚ and density of objects and liquids using common measuring devices and algebraic formulas. The metric system‚ the most common set of measurements used in science‚ which includes meters‚ liters‚ Celsius‚ and grams will be used. Procedure The following items were used within the experiment: (1) Metric ruler with centimeter (cm) and millimeter (mm)‚ (1)
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Content Page Items Page Introduction 4 Title 5 Problem Statement 6 Purpose of Project 7 Methodology 8 Literature Review 9 - 13 Journal Site-Visits 14 - 33 Laboratory Exercises 34 - 49 The Final Report Presentation of Data Bar Graphs 52 - 54 Line Graphs 55 - 56 Tables 57 – 58 Calculations 59 - 60 Discussion 61 - 63 Conclusion 64 - 65 Recommendations 66 - 67 Bibliography 68 – 70 Introduction This report is based on the study of ‘Species Diversity and Ecosystem Stability’
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To facilitate observation of carbohydrate utilization patterns- TSI agar slants contain lactose and sucrose (1%) concentrations and glucose (0.1%) concentration which permits detection of the utilization of this substrate only. The acid base indicator phenol red- also incorporated to detect carbohydrate fermentation that is indicated by a change in color of the medium from orange-red to yellow in the presence of acids. a. Method to inoculate slant: stab and streak procedure which requires
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This equation 1 accommodates different intercepts and slopes for years after and before trade liberalization. Sigma‚ is the standard deviation of the natural logarithm of real per worker income and t for year. Dr is dummy-variable regressor or an indicator variable‚ is coded 1 for all years after the trade liberalization and 0 for all years before the trade liberalization. In this equation‚ represent intercept and the value of sigma when year (t) is zero. The coefficient‚ represent the difference
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