Recent content by chemnerd666

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    Spectroscopy: Determining Phenol Concentration using Calibration curve

    Thank you all for your assistance, I probably would have gotten zero on this lab if I just did my own thing haha.
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    Spectroscopy: Determining Phenol Concentration using Calibration curve

    I cannot re-do the absorbances of each sample as this lab is for school. I followed a procedure made up by the lab instructor and she actually verified my calculations when making the standard solutions for the calibration curve, assuring me they were correct. So I guess I am S.O.L. for...
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    Spectroscopy: Determining Phenol Concentration using Calibration curve

    The b value isn't large, 0.4229. The math is correct because I did it all using spreadsheet. The problem lies in solving for the phenol concentration of the unknown samples, the equation of the line is y=0.7916x +0.4229, the y intercept is at 0.5 for absorbance. Both of the absorbances of the...
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    Spectroscopy: Determining Phenol Concentration using Calibration curve

    Hello, My problem is as follows: The lab I am working on requires the construction of a calibration curve from the measured absorbance of samples of known phenol concentration to intrapolate the phenol concentration of two unknown samples. I have constructed the calibration curve and...
    • chemnerd666
    • Thread
    • Calibration Concentration Curve Phenol Spectroscopy
    • Replies: 8
    • Forum: Chemistry
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    How Do You Calculate the Initial Rate of H2O2 Disappearance?

    Homework Statement In the reaction between H2O2 and I-, 15 mL of 0.30M KI, 75. mL of 0.10M H2O2 and 21 mL of 0.020M Na2S2O3 were mixed in a flask containing starch and buffer and the total volume was made up to 500mL with distilled water. The solution turned blue (indicating the presence of...
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    Solving the Electrochemistry Lab Problem: Determining Na2S2O3 Concentration

    Thank you for your help :)
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    Solving the Electrochemistry Lab Problem: Determining Na2S2O3 Concentration

    But can I use 0.01 mol/L to find the amount of moles in 20 mL of the potassium iodate?
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    Solving the Electrochemistry Lab Problem: Determining Na2S2O3 Concentration

    C1 is the initial concentration of the solution of potassium iodate, 0.01 mol/L, V1 is the initial volume of the solution, I assumed it was 1L, 20 mL of potassium iodate was diluted with 25 mL distilled water and 2 mL of 3M H2SO4 and 3mL of 1M KI were added. This would make the volume of the...
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    Solving the Electrochemistry Lab Problem: Determining Na2S2O3 Concentration

    interesting, but it has to be possible to calculate it somehow using standard equations, thanks anyways.
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    Solving the Electrochemistry Lab Problem: Determining Na2S2O3 Concentration

    Hello all this is my problem: Homework Statement I have to determine the concentration of a sodium thiosulfate solution used to titrate a potassium iodate solution. The only variable that is known is the concentration of the potassium iodate solution, 0.01 mol/L. There is 20 mL of 0.01 M...