- #1

dagg3r

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**Calucation of ERRORS - CHEM!**

hi I am doing one of those determining calcium hardness in swimming pool water here just stuck on a few bits

1) how do i convert concentration (mol/L) -> ppm ( parts per milliion) example i am given concentration of calcium = 8.595*10^-4 M how do i get parts per milliion?

2) i am told to calculate the error in calcium hardness found, all i am given are the error values of concentration EDTA in the burette as 0.01022M and the error 0.00003 M and the average titre volume is 8.41ml with error 0.02 cm^3 what am i meant to do with these errors? and how do i calculate the error in calicum hardness? is it something like this:

eg for first bit 0.00003/0.01022 + 0.02/8.41 don't know please help out