Spectrophotometric Copper Determination calculations

In summary: In summary, the conversation is about someone struggling with calculations for a chemistry lab. They have scanned and rewritten their answers in hopes of making them clearer, but are still unsure about how to do the calculations. They ask for assistance and provide links to images of the lab instructions. The other person responds by asking for information about molar absorbtivity and the original poster provides additional links to the instructions.
  • #1
cyanide6688
2
0
The template doesn't really work well for mine considering its a lab sorry ><. I am quite confused on how to do the calculations on my chemistry lab, i have scanned, and rewritten my answers so they would be more clear :-) . the questions i have are on the 3rd and 4th image, I am just really not sure how to do the calculations, if someone can show me how that would be great, i can do the graph and all that, I'm just not sure how to do the calculations. thank you very much, the lab report is below. (note, if the images are to small just keep clicking them, and they will open again, but larger)
***as an added token of my appreciation i will give the first person to answer this a free demonoid account***(if wanted) just trying to give something back :-)
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  • #2
I was looking at your images to find any information about molar absorbtivity. I found none. What did I miss, if anything?
 
  • #3
here are the instructions on how we made up the solutions. sorry for leaving them out ><

http://img863.imageshack.us/i/71934094.jpg/
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What is spectrophotometric copper determination?

Spectrophotometric copper determination is a method used to measure the concentration of copper in a sample using a spectrophotometer. This technique involves measuring the absorbance of light by the copper ions in the sample and using a calibration curve to determine the concentration of copper present.

What is a spectrophotometer?

A spectrophotometer is a scientific instrument used to measure the intensity of light at different wavelengths. It works by passing a beam of light through a sample and measuring the amount of light absorbed by the sample at each wavelength. This information can be used to determine the concentration of a substance in the sample.

How is a calibration curve used in spectrophotometric copper determination?

A calibration curve is created by measuring the absorbance of known concentrations of copper ions and plotting the data. This curve is then used to determine the concentration of copper in an unknown sample by measuring its absorbance and using the curve to find the corresponding concentration value.

What are the units of measurement for spectrophotometric copper determination?

The units of measurement for spectrophotometric copper determination are typically in parts per million (ppm) or milligrams per liter (mg/L). These units represent the concentration of copper ions in the sample.

What are some factors that can affect the accuracy of spectrophotometric copper determination?

Some factors that can affect the accuracy of spectrophotometric copper determination include sample contamination, improper calibration, and instrumental errors. It is important to carefully prepare and handle the sample, as well as regularly calibrate the spectrophotometer to ensure accurate results.

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