Recent content by chemnerd666

Thank you all for your assistance, I probably would have gotten zero on this lab if I just did my own thing haha.

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...

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...

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...

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...

Homework Statement Calculate the value of the equilibrium constant at 25 degrees celsius for the following reaction: 5Fe2+ + MnO4- + 8H+ ----) 5Fe3+ + Mn2+ + 4H2O Homework Equations The equation above is the product of these redox reactions: 1) MnO4- + 8H+ + 5e- ----) Mn2+ + 4H2O E=...

Homework Statement I am required to determine an average molarity for sodium hypochlorite solution, the experiment involved titrating 10 mL of 1:10 diluted bleach (sodium hypochlorite) with sodium thiosulfate, the volumes of titrant used to reach endpoint are, 17.95 mL, 18.31 mL and 18.21 mL...

Thank you for your help :)

But can I use 0.01 mol/L to find the amount of moles in 20 mL of the potassium iodate?

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...

interesting, but it has to be possible to calculate it somehow using standard equations, thanks anyways.

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...