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Click to zoom Determination of Water Hardness In this experiment the indicator eriochrome black T EBT is used to signal the presence of ions in the water sample. EBT binds with free metal ions in the water to form a pink complex. The blue color is used as the end point in the titration.
A sample of tap water is treated with EBT indicator. If the indicator turns from blue to pink, metal ions such as calcium and magnesium are present. To determine the concentration of ions present, the sample is titrated with a known molar concentration of EDTA.
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Please do not select any other shipping method. It will delay your order.COD determination has advantage over BOD determination in that the result can be obtained in about 5 hours as compared to 5 days required for BOD test.
The organic matter gets oxidized completely by K 2 Cr 2 O 7 in the presence of H 2 SO 4 to produce CO 2 and H 2 O. Research and Analysis report on the determination of water hardness.
In this experiment, the hardness of an unknown water sample will be determined. It was difficult in this lab to tell exactly when the endpoint occurred because the color changed to violet before blue.
It was hard to distinguish between these colors sometimes. Ultrapure water (also UPW or high-purity water) is water that has been purified to uncommonly stringent specifications. Ultrapure water is a commonly used term in the semiconductor industry to emphasize the fact that the water is treated to the highest levels of purity for all contaminant types, including: organic and inorganic compounds; dissolved and particulate matter; volatile and non.
Lab - Determining the Chemical Formula of a Hydrate Some ionic compounds form crystalline structures that trap water molecules within the crystalline.
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The hardness of a water sample was successfully discovered by finding the calcium content in the sample. The calcium content from the three trials performed were ppm, ppm, and ppm.
The average of these three trials with standard deviation was ± ppm.