Exam 1 Studyguide
Exam 1 Studyguide CHM 220
Kutztown University of Pennsylvania
Popular in Environmental Analysis
Popular in Chemistry
This 2 page Study Guide was uploaded by Cathryn Notetaker on Wednesday February 24, 2016. The Study Guide belongs to CHM 220 at Kutztown University of Pennsylvania taught by Julie Palkendo in Spring 2016. Since its upload, it has received 44 views. For similar materials see Environmental Analysis in Chemistry at Kutztown University of Pennsylvania.
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Date Created: 02/24/16
Exam 1 Terms Matrix- complex, unknown sample Analytes- what is being tested for 6 Challenges faced in ENV Analysis 1. Complex, unknown sample matrix 2. Analytes may be only in very low concentrations 3. Wide range of samples 4. Large number of samples 5. Some analyses must be made at the sampling site 6. Knowledge of state and federal regulations/policies Analytical Method (8) 1. Question 2. Choose method 3. Sampling 4. Sampling prep 5. Analysis 6. Report and interpret 7. Draw conclusion 8. Method validation and quality assurance Types of Error 1. Systematic- determinate can be fixed 2. Random- indeterminate cannot be fixed 3. Gross- caused by human error Principles of a Titration 1. Titrant of known concentration added to a known volume of sample 2. Exact volume of the titrant at the endpoint 3. Stoichiometric ratio (Q) of the titrant 4. Unknown concentration of the analyte can be determined Acidity- capacity of water to neutralize base (OH ) Types of Indicators 1. Methyl orange (pH range 3.1-4.4) Measures “Mineral Acidity” (strong acids neutralized) 2. Phenolphthalein (pH range 8.0-9.6) Measures “Total Acidity” (strong acids and weak acids neutralized) Gravimetric Analysis- measurement of analyte by weight 3 Types: 1. Decomposition 2. Precipitation 3. Filtering/ Extraction
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