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Question 19 (5 points) Match each water testing method with the best description below. There is one best correct response per match. 1. Involves filling a sample bottle completely with water and fixing it using a series of reagents that form a titrated acid compound. Used for detecting dissolved oxygen concentrations in the sample 2. Relies on a colorimeter where a light source passes through a sample and what passes through the sample is recorded on a photodetector. Visual Methods J. Using a sample of known volume and an indicator, just enough of a solution of known Electronic Methods strength is added to produce a color reaction. Based on the Colorimetric Methods concentration of the solution and the volume of sample, the Titrimetric Methods concentration of the sample can be calculated. Accesses water using the Octet Winkler Method 4. Comparator, which uses standards permanently mounted in a plastic comparator block. The sample is compared to these known standards in a viewing window. 5. Testing is based on sample comparison to standards of increasingly known concentrations of the constituent to be analyzed. Based either on pH or Beer's