This previous week our class did a lab lab which examined the relationship between the molar concentration of a solution and absorbency. Furthermore we also studied molarity and worked with a couple of stoichiometry problems. These were the main areas we covered in class and on the Moodle this week and they are interconnected. We learned that concentration is directly related to molarity and we used this information to aid us in our lab.
The first activity we worked on this week was a lecture quiz online regarding molarity. The major and most important thing we learned from this quiz is the equation, Molarity (M) = moles of solute / volume of the solution in liters. This concept is critical to understand and is closely related to the idea of dilution we studied in the lab. Another important concept we learned from the lecture quiz is the fact that volume is temperature dependent. The first concept is related to the lab because in the lab we saw that the moles of solute (the blue dye) would decrease as we increased the amount of water in the solution and as the solution became more diluted. The temperature concept in the moodle quiz is also related because it has to do with molarity and when the temperature goes up the volume goes up and the molarity will then decrease. Another thing we learned is about the different types of pipettes, their uses, and how they affect the amount of moles of a solution and the volume of a solution depending on which pipette you're using.
<-- We used a pipette like this in our lab to help accurately create the solutions.
<-- We used a cuvette to put the solution in and we put the cuvette in the colorimeter
After doing the lecture quiz, we worked on some difficult stoich problems. To do these we used the knowledge we previously had on molar mass, moles, and the relationship between grams and moles. Knowing this we were able to solve a lot of problems involving these concepts. An important equation for this secion was mass x molar mass = weight. by using this equation we were able to examine the relationship between moles, mass, weight, and atoms in the problems we did. Because the stoich problems were challenging for me, I looked for some extra help online and found the URL to a good video further explaining stoichiometry. http://www.youtube.com/watch?v=lVT0S-W_wEM
The last thing we did this week was a lab examining the relationship between concentration and absorbency. To do this lab we first altered the concentration of many different solutions of blue #1 dye and water and finding the absorbency of the different solutions. Then we looked at different absorbency levels of Powerade and Gatorade G2 to find the concentration of blue #1 dye in these solutions. We then developed a linear equation between between these two variables and performed calculations with this knowledge. This lab required previous information from the lecture quiz and stoich problems.
We came to figure out and understand these problems through experimentation and completing many problems in class. The thing that confused me the most this week was Beers law, especially since there was a problem we did in class on Friday that required us to apply Beers law. I would definitely like to gain a better understanding of the relationship.I participated very well this week, especially in the lab which I found to be very fun and interesting. Overall, on a scale of 1-5 I understand the material covered this week at about a 3. At this point I do not have any new questions to ask, but I need to review more so I can better understand everything.
The first activity we worked on this week was a lecture quiz online regarding molarity. The major and most important thing we learned from this quiz is the equation, Molarity (M) = moles of solute / volume of the solution in liters. This concept is critical to understand and is closely related to the idea of dilution we studied in the lab. Another important concept we learned from the lecture quiz is the fact that volume is temperature dependent. The first concept is related to the lab because in the lab we saw that the moles of solute (the blue dye) would decrease as we increased the amount of water in the solution and as the solution became more diluted. The temperature concept in the moodle quiz is also related because it has to do with molarity and when the temperature goes up the volume goes up and the molarity will then decrease. Another thing we learned is about the different types of pipettes, their uses, and how they affect the amount of moles of a solution and the volume of a solution depending on which pipette you're using.
<-- We used a pipette like this in our lab to help accurately create the solutions.
<-- We used a cuvette to put the solution in and we put the cuvette in the colorimeter
After doing the lecture quiz, we worked on some difficult stoich problems. To do these we used the knowledge we previously had on molar mass, moles, and the relationship between grams and moles. Knowing this we were able to solve a lot of problems involving these concepts. An important equation for this secion was mass x molar mass = weight. by using this equation we were able to examine the relationship between moles, mass, weight, and atoms in the problems we did. Because the stoich problems were challenging for me, I looked for some extra help online and found the URL to a good video further explaining stoichiometry. http://www.youtube.com/watch?v=lVT0S-W_wEM
The last thing we did this week was a lab examining the relationship between concentration and absorbency. To do this lab we first altered the concentration of many different solutions of blue #1 dye and water and finding the absorbency of the different solutions. Then we looked at different absorbency levels of Powerade and Gatorade G2 to find the concentration of blue #1 dye in these solutions. We then developed a linear equation between between these two variables and performed calculations with this knowledge. This lab required previous information from the lecture quiz and stoich problems.
We came to figure out and understand these problems through experimentation and completing many problems in class. The thing that confused me the most this week was Beers law, especially since there was a problem we did in class on Friday that required us to apply Beers law. I would definitely like to gain a better understanding of the relationship.I participated very well this week, especially in the lab which I found to be very fun and interesting. Overall, on a scale of 1-5 I understand the material covered this week at about a 3. At this point I do not have any new questions to ask, but I need to review more so I can better understand everything.
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