front 1 Which piece of lab glassware listed below is the most accurate for measuring an amount of sample? | back 1 Volumetric pipet |
front 2 Specific conductance or conductivity is depends on what factors? | back 2 TDS and temperature |
front 3 What is caused by the presence of suspended matter such as silt, finely divided organic and inorganic matter and microscopic plants such as algae? | back 3 Turbidity |
front 4 What is the range of the pH scale? | back 4 0-14 |
front 5 The pH of a sample is preserved with an acid to pH 2.0. If the sample pH initially was 7.0, how many times more acidic is the sample at 2.0? | back 5 100,000 times |
front 6 What is a problem with hard water? | back 6 The water forms insoluble precipitates of soap |
front 7 Why must the operator be cautious about using a home as a sampling | back 7 The home may have a water softener |
front 8 A pH reading of 7.0 indicates what? | back 8 The water is neither acidic or basic |
front 9 What are two types of color found in water? | back 9 True color and apparent color |
front 10 The greatest errors in laboratory tests are usually caused by what? | back 10 Improper sampling |
front 11 The pH of water being softened has risen from 7.0 to 9.0. How many times more basic is the pH? | back 11 100 times more basic |
front 12 The operator has collected a sample for pH at a remote tap. The pH meter was calibrated with a 7.0 and a 10.0 pH buffer, but the pH of the sample reads 6.5. What should the operator do? | back 12 Recalibrate the meter with pH buffers that bracket the result, collect a fresh sample and re-measure the pH |
front 13 What sample volume is used for collection of all coliform samples? | back 13 100 mL |
front 14 Accurate water temperature readings are important not only for historical purposes but also because of its influence on what? | back 14 Chemical reaction rates and water stability |
front 15 What is a test to determine the degree of calcium carbonate saturation in a water sample? | back 15 Marble test |
front 16 The maximum allowable concentration of this metallic salt is 250 mg/L and is established more for taste reasons than as a health hazard. | back 16 Chloride |
front 17 Why is sodium thiosulfate added to a Bac-T sample? | back 17 To neutralize any residual chlorine |
front 18 What treatment methods can remove or reduce true color? | back 18 •Slow sand filtration, manganous greensand filtration or diatomaceous earth filtration •Coagulation with ferric chloride, aeration or sedimentation •Coagulation, chlorination or ozonation •Coagulation and flocculation |
front 19 Information from algae counts can serve what purpose? | back 19 Help explain the cause of color, turbidity, taste and odors |
front 20 What are the two types, or classifications, of water hardness? | back 20 Cabonate and non-carbonate |
front 21 High amounts of nitrate in drinking water can cause what? | back 21 Blue baby syndrome (methemoglobinemia) |
front 22 A Class D type fire has ignited in the lab. This fire involves what? | back 22 Combustible metals |
front 23 Convert 550 C to F | back 23 1,022 degrees F |
front 24 What are jar tests designed to show? | back 24 The effectiveness of chemical treatment in a water treatment facility |
front 25 What is the maximum holding time for a total coliform sample? | back 25 •28 days •30 hours •15 minutes •6 hours |