Objective: State the aim of the experiment in your own words, usually around 2-4 sentences. A clear statement of the overall purpose for performing the experiment. For example, what is / are the goal(s) to be achieved and what idea(s) are you to learn during the duration of the project?
You will need to bring in TWO water samples (~250 mL per sample) from various sources. Here are some suggestions: tap water from various sites, pond water, and lake water. You are free to collect any water samples you are interested in testing their water hardness; make sure the samples are fairly diverse. Label the water samples you collect for accurate testing.
Using the standardized EDTA solution you prepared and saved last week, titrate and calculate the concentration of calcium ions of your water samples.
Next, run the samples through an ion exchange column; then calculate the calcium concentration of your water samples AFTER filtrating them through the ion exchange column. Use a conductivity meter and the EDTA titration to compare the calcium concentration of your water sample BEFORE and AFTER the ion exchange column filtration. Use the tables provided to collect and construct your data.
Include this information in the Methods and Procedures section of the pre-lab plan submission rubric below.
1. What is an ion-exchange column?
2. How does an ion-exchange column work?
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