General Instructions

In this activity, you will calculate solution concentrations using molarity and perform dilution calculations using the dilution equation. To successfully achieve this, you will need to review all the study materials for module six (compounds and stoichiometry).

Step 1: Select and Reflect

Select lesson three (molarity) in module six and demonstrate your understanding of them in theoretical and practical settings.

Step 2: Respond

Using supporting data for your arguments, prepare a 300-350 word written piece which discusses any of the following: 

1. You are given a solution of a mysterious substance that you need to identify. You have been told that the solution has a molarity of 0.5 M. To identify the substance, you need to determine the concentration of the solution. 

Questions: 

1. How can you use the molarity of the solution to determine the concentration? 
2. What instruments can you use to measure the concentration of the solution? 
3. What is the difference between molarity and concentration? 
4. How do you calculate the molarity of a solution?

2. John is a scientist in a chemical lab. He needs to dilute a chemical solution currently at a concentration of 10M. He has a 1L volumetric flask filled with water at a concentration of 0.001M.

John needs to use the dilution equation to determine how much of the 10M solution he needs to add to the 1L volumetric flask to achieve a desired concentration of 0.01 M.

Questions:

1. How much of the 10M solution does John need to add to the 1L volumetric flask to achieve a concentration of 0.01M?
2. What is the final volume of the diluted solution?
3. What is the concentration of the diluted solution?

Step 3: Share 

To share your work, click on the “Add a new discussion topic” button under this post and paste your work into the “Message” box. Make sure to reference others’ intellectual property when necessary. All references should follow 7th Edition APA formatting. For further instructions, see the resource on the Himmelfarb Health Sciences Library: APA citation resource (N.B.: references are excluded from word counts).

Step 4: Interact 

To complete the activity, evaluate and categorize the work from one of your peers based on items A - E of the rubric below. Provide a rationale for the grade you have provided and comments or suggestions for improvement. To post a reply, click “Reply” on a particular discussion, write your feedback, and click “Post to forum.” You can use the list below as an example:

Item A is  .…. because….  My suggestions for improvement are….
Item B is  .…. because….  My suggestions for improvement are….
Item C is  .…. because….  My suggestions for improvement are….
Item D is  .…. because….  My suggestions for improvement are….
Item E is  .…. because….  My suggestions for improvement are….

OPTIONAL Step 5: Interact (10 minutes)

If you would like to, you can reply to your peers' posts in a respectful and professional manner. Ensure that your post engages your peers' ideas by including a reflection on their comments, sharing ideas of other potential difficulties and parties involved, or asking thought-provoking questions. If a peer comments on your posting, please reply. To post a reply, click “Reply” on a particular discussion, write your feedback and then click on “Post to forum.”