Question

chemistry: chemical reactions - testing for ions experiment
station #1. identifying the absence of ions in the water samples

1. identify three physical properties of the samples. complete the following chart.
2. use the electrical conductivity tester to test the conductivity of each solution.

a. turn on the conductivity tester and insert the end into the sample.
b. use the wash bottle to rinse the tester into the sink.
c. test the other two samples. be sure to rinse before each test using the wash bottle.
d. when finished, rinse the tester again using the wash bottle.
station #2. identifying the presence of lithium ions in the water samples

1. light the bunsen burner following the steps learned in class.
2. remove the popsicle stick from sample #1 and insert it into the base of the flame for 4 - 5 seconds and observe the colour produced. return the popsicle stick to the solution.
3. repeat for the other samples and complete the following chart.

station #3. identifying the presence of calcium ions in the water samples

1. use the plastic dropper to add the 3 water samples to different wells in the spot plate.
2. add 4 drops of the tester solution to each sample of water to test for the presence of calcium ions.
3. record your results below.
4. rinse the spot plate into the sink when finished, and dry it with a paper towel.

analysis questions

1. summarize your results by stating which sample is the distilled water, which sample is the arizona river water and which sample if the kitchener tap water. briefly explain how you were able to come to your conclusion. sample #1 was ________, i know because ________
2. kitchener water is hard water. research what this means.
3. identify an industry/career that requires water to be tested for ions. identify what ion they test for and why.

Explanation:

Step1: Analyze electrical - conductivity results

Distilled water has low conductivity as it has few ions. Sample 1 has no conductivity (N), so it could be distilled water.

Step2: Analyze calcium - ion results

Hard water contains calcium ions. Kitchener water is hard water. Sample 3 has calcium ions (Y), so it could be Kitchener water.

Step3: Determine the remaining sample

The remaining sample, Sample 2, is likely the Arizona river water.

Answer:

Sample #1 was distilled water, I know because it had no electrical conductivity and no calcium ions.
Sample #2 was Arizona river water.
Sample #3 was Kitchener tap water, I know because it had calcium ions and is known to be hard - water.