Difference between revisions of "Water Lab"
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<strong>Welcome to the Water Lab</strong> | <strong>Welcome to the Water Lab</strong> | ||
| − | + | The purpose of this lab activity is to expose the student to concepts of ion solubility, chromatography, and concentration. | |
| − | == Part 1: Water Sampling == | + | ==Part 1: Water Sampling== |
At your lab bench you will find 4 water samples labeled A, B, C, and D. All of these water samples have come from potable (drinkable) sources. | At your lab bench you will find 4 water samples labeled A, B, C, and D. All of these water samples have come from potable (drinkable) sources. | ||
| Line 11: | Line 11: | ||
:d) Once your group has discussed the finding, the instructor will provide you with a list of the water sources and as a group assign letters to water source. | :d) Once your group has discussed the finding, the instructor will provide you with a list of the water sources and as a group assign letters to water source. | ||
| − | == Build a Conductivity Meter == | + | ==Part 2: Ion Chromatography Data== |
| − | :a) As a group, construct a conductivity meter using the materials at your bench; diagram [[Media:Breadboard_layout.jpg]]. | + | |
| + | == Part 3: Build a Conductivity Meter == | ||
| + | :a) As a group, construct a conductivity meter using the materials at your bench; diagram [[Media:Breadboard_layout.jpg|here]]. | ||
:b) Test the water samples from Part 1; enter conductivity info in lab notebook. | :b) Test the water samples from Part 1; enter conductivity info in lab notebook. | ||
:c) Review your "assignments" above and reassign if necessary. | :c) Review your "assignments" above and reassign if necessary. | ||
:d) The instructor will not reveal the identify of the water samples. | :d) The instructor will not reveal the identify of the water samples. | ||
| − | == Molarity, Dilutions, and Personal Taste Threshold == | + | ==Part 4: Molarity, Dilutions, and Personal Taste Threshold== |
| − | As a group, make the following 3 solutions: | + | As a group, make the following 3 solutions (generally one at a time): |
| + | ::(''suggestion: do all of your calculations now'') | ||
:a) Make 200 mL of a 0.04 M NaCl (aq) solution. | :a) Make 200 mL of a 0.04 M NaCl (aq) solution. | ||
| − | :b) Make 200 mL of a 0.001 M citric acid (aq) solution. | + | :b) Make 200 mL of a 0.001 M [https://en.wikipedia.org/wiki/Citric_acid citric acid] (aq) solution. |
| − | :c) Make 200 mL of 0.04 M sucrose or fructose (aq) solution. | + | :c) Make 200 mL of 0.04 M sucrose or [https://en.wikipedia.org/wiki/Fructose fructose] (aq) solution. |
| − | :d) Make a serial dilution of each sample above. This | + | :d) Make a serial dilution of each sample above. This is explained in the figure below. |
| − | :e) Sample (taste) the solution in the order of least concentrated to most. At which concentration | + | [[File:Serial dilution.jpg|200px|thumb|center|serial dilution]] |
| + | :e) Sample (taste) the solution in the order of least concentrated to most. At which concentration are you able to "detect" the flavor. | ||
'''Summarize your finding in your lab notebook and then turn in your carbon copies.''' | '''Summarize your finding in your lab notebook and then turn in your carbon copies.''' | ||
Latest revision as of 18:23, 13 March 2017
Welcome to the Water Lab
The purpose of this lab activity is to expose the student to concepts of ion solubility, chromatography, and concentration.
Part 1: Water Sampling
At your lab bench you will find 4 water samples labeled A, B, C, and D. All of these water samples have come from potable (drinkable) sources.
- a) Label a plastic cup A, B, C, and D and collect a sample from each.
- b) Sample (taste) the waters and make notes about your perception and preference...ON YOUR OWN/NOT A GROUP DISCUSSION.
- c) Now, as a group discuss your findings.
- d) Once your group has discussed the finding, the instructor will provide you with a list of the water sources and as a group assign letters to water source.
Part 2: Ion Chromatography Data
Part 3: Build a Conductivity Meter
- a) As a group, construct a conductivity meter using the materials at your bench; diagram here.
- b) Test the water samples from Part 1; enter conductivity info in lab notebook.
- c) Review your "assignments" above and reassign if necessary.
- d) The instructor will not reveal the identify of the water samples.
Part 4: Molarity, Dilutions, and Personal Taste Threshold
As a group, make the following 3 solutions (generally one at a time):
- (suggestion: do all of your calculations now)
- a) Make 200 mL of a 0.04 M NaCl (aq) solution.
- b) Make 200 mL of a 0.001 M citric acid (aq) solution.
- c) Make 200 mL of 0.04 M sucrose or fructose (aq) solution.
- d) Make a serial dilution of each sample above. This is explained in the figure below.
- e) Sample (taste) the solution in the order of least concentrated to most. At which concentration are you able to "detect" the flavor.
Summarize your finding in your lab notebook and then turn in your carbon copies.