Water analysis

Topics: PH, Water, Bicarbonate Pages: 16 (4755 words) Published: October 17, 2014


Analysis: Water Analysis

Jasmine Kennedy Bey

Lab Partners: Mohammed Alabbad, Drew Blackson

Chemistry 1290-020

3/26/2014

TA: Rajendr Thakuri

Purpose/Abstract:
Students are tested for their knowledge of basic titration technique and proper usage of specific-use probes (those used for conductivity, alkalinity, and pH, chloride, nitrate and hardness detection) on Logger Pro software. The purpose of this comprehensive lab is to determine the chemical properties of public drinking water found at four specific locations in the Toledo Ohio area. Students test the various properties of this drinking water by subjecting it to the following tests: pH tests, conductivity tests, total and phenolphthalein alkalinity tests, total hardness, chloride tests, and nitrates tests. With respect to the data collected in this lab, students also use conversion factors to calculate the parts per million. Following directions carefully and prudently is crucial for the success of the experiment and as well to the fact that the testing will be finished during the lab period. Tests like these are perform daily by industrial water treatment plant in order to ensure the Toledo public’s drinking water is safe. These plants are required by government agencies such the EPA to report its findings within a written deadline. Obviously reports of water quality that are not up to the government’s standards, (all of the standards will be listed at a later section in the report) will be subjected to further testing and isolated from public access until the standards are met. This lab mimics the daily routines of employed chemists at these facilities on a smaller scale. Students that chose to enter such profession will be held responsible for using the techniques learned in this lab.

Safety Information: Most of the chemicals used in this lab are dangerous. Avoid bodily contact, ingestion or any type of spills. Assume that all of the reagents used in the lab are poisonous.

Materials:
pH probe, conductivity probe, nitrate probe, chloride probe, Two hood stations containing the following: 50 mL buret, buret clamp, ring stand, laptop From your drawer: one large waste beaker (600mL), two 250 mL flasks, 50mL graduated cylinder, two 150mL beakers Chemicals:

Four (4) plastic bottles of water samples,
Two (2) Nitrate probe standards: 1mg/L and 100mg/L
Three (3) pH probe Standards: pH 4, pH7 and pH10,
Two (2) chloride probe standards: 10mg/L and 1000mg/L
Two (2) Conductivity Standards: 150 mS/cm and 1413mS/cm
Three (3) indicators: Univer3 Indicator, Phenolphthalein Indicator and Bromocresol Green Methyl Red Indicator Two (2) titrants: 0.01M HCl (Hydrochloric acid) and 0.01M EDTA (Ethylenediaminetetraacetic acid)

Procedure:
pH Test:
1.)The laptop should have the experiment already open. If not, select the 1290 folder and then open Exp. 24 Acid/Base Titration. 2.)Calibrate the pH probe using a two-point calibration. There will be pH 4, 7, and 10 buffers available to perform the calibration. 3.)Analyze the sample’s pH

a.Rinse the pH probe thoroughly with distilled water. Place the probe into a small beaker that contains one of the two calibration buffer solutions. b.Choose Experiment, Calibrate…, and select the Sensor Setup tab. With the button for Port 1 (or Channel CH1) depressed, confirm or choose the Sensor: pH probe and Calibration: pH. Select the Calibrate tab and click on Calibrate Now. c.Gently stir the buffer with the pH probe. When the voltage reading of the pH probe is stable. Enter the pH value of the buffer solution (read off of the bottle of buffer solution) to the nearest 0.01 into Value 1 and press Keep. d.Rinse the probe with DI water and then place it in a small beaker that contains the second calibration solution. When the reading is stable, enter the pH value of the buffer solution to the nearest o.o1 into Value 2 and press Keep. Press OK to store the...

Cited: Kippenham, Edith. (2013-2014) “Water analysis” CHEM 1290 Lab Manual, pages 113-117 and 144a-144b
(Source: Conductivity Probe, Vernier Software and Technology via their website www.vernier.com/support/manuals/ retrieved March 20,2014
“Explanation of Water Hardness, via their website http://www.fcwa.org/water/hardness.htm retrieved March 26, 2014
“pH” via their website http://www.odh.ohio.gov/en/odhprograms/eh/water/quality_treatment/pH.aspx retrieved March 26, 2014
“Conductivity” via their website http://water.epa.gov/type/rsl/monitoring/vms59.cfm retrieved March 26, 2014
“Water Quality Standards Program” via their website http://www.epa.state.oh.us/dsw/wqs/index.aspx retrieved March 26 2014
“Basic Information about Disinfectants in Drinking Water: Chloramine, Chlorine and Chlorine Dioxide” via their website http://water.epa.gov/drink/contaminants/basicinformation/disinfectants.cfm retrieved March 26, 2014
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