Consider before watching the videos:

What salts have names other than their chemical name?

Lab Experiments (Write protocols based on the videos then complete your protocols as you perform experiments in class):

1. Making the Rochelle Salt

 

Lab Technique videos (Use these if you need help with your measurements)

1. Weighing

 

Data analysis and calculations (Use these if you need help with your data and calculations)

1. Rochelle Salt Synthesis

 

The pre-lab will be due before your lab class meets and must include Experimental Protocol, Chemical Table and Equipment Table. The actual numbers will be adjusted based on your starting mass of cream of tartar.

(Analysis) Watch the experiment videos. Take notes on the protocols. Stop the videos and re-watch as necessary to acquire details of the procedure. Write out the protocol for each part of the experiment.  (It can be written in sequential steps.  Complete sentences are not necessary.)  This is the protocol you follow, so be detailed.

(Analysis) Identify the equipment (type AND size) needed for the experiment and include the name and an image (picture) of each.  Be sure to describe the equipment, how to use it, and why it is suitable for this use.

Equipment Name	Equipment Picture or Description	Intended Purpose

1. (Acquiring competencies) Following your detailed protocol, perform all the experiments. Record your observations and take pictures of your key steps in the process. Your observations and images need to be incorporated in your data section and this section should be as detailed as possible as you will use this information to complete your discussion.

2. (Manipulation) Using the mass of recrystallized cream of tartar, calculate the grams of sodium carbonate needed for the reaction.
3. Using the mass of recrystallized cream of tartar, calculate the grams of Rochelle salt expected to form.
4. (Manipulation) Using the predicted grams of Rochelle salt and its solubility, calculate the volume of water needed for your reaction.
5. (Representation) Fill in the table below:

Initial mass of cream of tartar (g)	Moles of cream of tartar	Moles of sodium carbonate	Grams of sodium carbonate (g)	Volume of water (mL)
Calculated
Actual

1. (Representation) Write the chemical formula for the Rochelle salt.
2. (Existing knowledge, research, and views) Describe the difference between a saturated and unsaturated solution.
3. (Representation) Write the balanced molecular equation for the synthesis of Rochelle salt from potassium bitartrate and sodium carbonate.
4. (Interpretation) Describe the meaning of the previously written molecular equation on the microscopic and macroscopic scale.
5. (Representation) Write the complete ionic equation for the synthesis of Rochelle salt from potassium bitartrate and sodium carbonate.
6. (Representation) Write the net ionic equation for the synthesis of Rochelle salt from potassium bitartrate and sodium carbonate.
7. (Interpretation) Describe the meaning of the previously written net ionic equation on the microscopic and macroscopic scale.
8. (Analysis) Classify the chemical reaction and justify your selection. (Hint: It could be multiple types.)
9. (Analysis) Provide at least one reason to heat the mixture of cream of tartar and sodium carbonate.
10. (Analysis) Comment on how you determined when to stop the experiment and use the interpretation of your chemical equations to support your decision.
11. (Analysis) Comment on the purpose of the stir plate.
12. (Existing knowledge, research and views) Solids can be crystalline or amorphous. Describe at least 3 characteristics of a crystalline solid.
13. (Analysis) Identify at least one of the 12 principles of green chemistry applied in this experiment. Justify your selection. 12 Principles of Green Chemistry
14. (Assumptions and analysis) Fill in the following table using the observations and data from your experiments.

Assumptions made	Testing the assumption	If assumptions are wrong ...
Rochelle salt is the only solid formed in the reaction	Add HCl and look for bubbling
The product solution is saturated

   

Summary

The summary has two parts: an abstract and an experimental protocol reflecting the experiment that you actually performed. The abstract and experimental protocol should both be between 100-250 words, size 12 Arial font each. There may be multiple experimental protocols for one experiment.

Part 1.

Title of Experiment: Performed tasks and applied techniques to accomplish the goal of the experiment and a description of the system under study (the title you are given for the lab is insufficient). Ex. Synthesis of Rochelle Salt from Sodium Carbonate and Recrystallized Potassium Bitartrate by combination in Water at Elevated Temperature

(This is a highlight of what you learned from performing the experiment and processing your collected data. Below is a template and an example of what you are expected to write.) In this lab experiment we investigated [purpose of your experiment] using [list the materials you worked with] and we found that [present the highlights of your results (include numbers)]. The results [present significant results]. The collected data compares to [draw conclusion about your results compared to other sources (this could be another group or the literature value)]. The [add type of measurement individually] measurement was collected using [describe instrument by sensitivity].   Think through this before writing:

1. Purpose: What were you trying to do?
2. Materials used: What chemicals and materials did you work with?
3. Method: What instruments were used to collect measurements and how were the measurements collected?
4. Results: What did you find out about the objects under study?
5. Significance: What did you learn about the precision and accuracy of your techniques? How do your determined values compare to reported values?

  Ex. In this lab experiment we synthesized …(desired product) from …(materials) using …(method). The mass of …product is assumed to be …grams which in …mL of water would produce…(type) solution. Crystals of … are expected to form by …(method). All mass measurements were collected on digital scales with 0.01 g sensitivity.

Part 2.

Title of Protocol (Brief description of the experiment in bold) Ex. Synthesis of Rochelle Salt and Preparation for Crystal Growth  

Experimental Protocol

(This is a condensed and organized description of the protocol you actually completed during class. Use the exact amounts of materials and list the exact equipment that you used in performing the experiment. The length of this section depends on the complexity of your experiment, usually 3-4 sentences maximum in one paragraph.) Reaction of … We added … grams (…moles) of …(reactant 1) and …grams (moles) of …(reactant 2) in a …mL …(equipment). A …mL amount of …(solvent) and a magnetic stir bar were added to the mixture and …(action taken in detail: what and how long?). The reaction was monitored … (describe method) and was considered complete when…(describe condition). Growing crystals of Rochelle salt. (For each material and procedure)