Experiment Details - Experimentium

Experiment of pH Indicator(Remote) Details

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Experimental Protocol

Chemical Table

(Representation) Prepare your chemical table including the materials you will use in the experiment. Here is a general template that you may use.
<table>
<tbody>
<tr>
<td>Chemical Name</td>
<td>Chemical Formula</td>
<td>Molar Mass (g/mol)</td>
<td>Hazards</td>
<td>Reference</td>
<td>PPE</td>
</tr>
<tr>
<td>Sodium Chloride</td>
<td>NaCl</td>
<td>58.5</td>
<td>Skin irritation</td>
<td><a href="https://fscimage.fishersci.com/msds/21105.htm">https://fscimage.fishersci.com/msds/21105.htm</a></td>
<td width="57"> </td>
</tr>
<tr>
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</tr>
</tbody>
</table>

Equipment Table

Data Collection

Data Processing

1.(Representation) Create a table showing all the materials tested with the purple cabbage indicator that you created. At least 3 of these should be tested using the simulation software (<a href="https://phet.colorado.edu/en/simulation/ph-scale">https://phet.colorado.edu/en/simulation/ph-scale</a>) and for those, the pH should be recorded. Classify the substances you tested in your pH experiment as acidic, basic, or neutral.
<table width="633">
<tbody>
<tr>
<td width="105">Tested substance</td>
<td width="138">Color

(descriptive)</td>
<td width="137">pH from the simulation</td>
<td width="253">Acidic/Basic/Neutral</td>
</tr>
<tr>
<td width="105"></td>
<td width="138"></td>
<td width="137"></td>
<td width="253"></td>
</tr>
<tr>
<td width="105"></td>
<td width="138"></td>
<td width="137"></td>
<td width="253"></td>
</tr>
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<td width="105"></td>
<td width="138"></td>
<td width="137"></td>
<td width="253"></td>
</tr>
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<td width="105"></td>
<td width="138"></td>
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<td width="138"></td>
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</tr>
</tbody>
</table>
2.(Analysis) Evaluate your results by comparing the descriptive colors associated with materials that are acidic, basic, or neutral.
3.(Representation) Organize the observations from your team into a table.
4.(Assumptions and Analysis) Fill in the following table using the observations and data from your experiments.
<table>
<tbody>
<tr>
<td width="177">Assumptions made</td>
<td width="271">Testing the assumption</td>
<td width="224">If assumptions are wrong ...</td>
</tr>
<tr>
<td width="177">The purple cabbage solution is neutral.</td>
<td width="271">Test the pH of the purple cabbage solution using a different method.</td>
<td width="224"></td>
</tr>
<tr>
<td width="177"></td>
<td width="271"></td>
<td width="224"></td>
</tr>
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<td width="177"></td>
<td width="271"></td>
<td width="224"></td>
</tr>
</tbody>
</table>

Discussion

Write a minimum one-page (12 font, single spaced) discussion on the experiment conducted this week. Address at least one question in each category as fully as possible integrating the collected data, providing explanations for the observed trends, and evaluating whether your original assumptions about the experiment were validated by the results. The assignment will be graded on completeness, clarity of the explanations and the meaningful integration of the collected and calculated data. Correct grammar and appropriate format for the chemical formulae and chemical reactions is expected. You may use the outline included at the end of this document on how to build your essay to address each category.

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<ol>
 	<li>(Existing knowledge, research, and views) Define pH and describe what it is used for.</li>
 	<li>(Existing knowledge, research, and views) Describe the pH indicator used in this experiment and how it was prepared. If the indicator wasn’t the whole purple cabbage, identify the specific compound.</li>
 	<li>(Existing knowledge, research, and views) Look up the approximate pH of the materials you tested for this experiment. Include a reference for your source.</li>
 	<li>(Analysis) Compare the findings from your experiment with the published results and comment on the accuracy of your experiment.</li>
 	<li>(Analysis) Compare the observations from your team and comment on the precision of the experiment.</li>
 	<li>(Analysis) Predict the color of the indicator and the range for the pH of the solution if a strong acid like HCl is used in place of the vinegar. Provide an explanation for your choice.</li>
 	<li>(Analysis) Predict the color of the indicator and the range for the pH of the solution if a strong base like NaOH is used instead of sodium bicarbonate. Provide an explanation for your choice.</li>
 	<li>(Analysis) Predict the color of the indicator and the range for the pH of the solution if a higher concentration of the acetic acid was used instead of the 5% vinegar. Provide an explanation for your choice.</li>
 	<li>(Existing knowledge, research and views) Describe at least 2 additional methods for determining if a substance is acidic, basic or neutral.</li>
 	<li>(Analysis) Select the method that is most sensitive among the 2 proposed options and provide a supported argument for your choice.</li>
 	<li>(Experimental design) Describe the preparation of another indicator solution for instances when purple cabbage is not available.</li>
 	<li>(Experimental design) Purple cabbage solutions provide a visual response to pH changes. Propose an indicator that provides a non-visual response to interactions with acids and bases.</li>
 	<li>(Experimental design) Describe a practical application that requires you to determine the pH and provide a convincing argument why the purple cabbage indicator may or may not work for that purpose.</li>
</ol>