Analytical Chemistry Final - ACS Exam 2024 -2025 Molarity - ANSWER -moles analyte/liter of solution Volume Percent - ANSWER -(volume solute/volume soution)x100 Volume ppm - ANSWER -(volume solute/volume solution)x10^6 deci- - ANSWER -10^-1 centi - - ANSWER -10^-2 milli - - ANSWER -10^-3 micro - - ANSWER -10^-6 nano - - ANSWER -10^-9 pico- - ANSWER -10^-12 femto - - ANSWER -10^-15 kilo- - ANSWER -10^3 weight percent - ANSWER -(grams analyte/grams sample)x100 ppt - ANSWER -(grams analyte/grams sample)x10^3 ppt simplified - ANSWER -gram analyte/liter solution ppm simplified - ANSWER -mg analyte/liter solution ppm - ANSWER -(grams analyte/grams sample)x10^6 ppb simplified - ANSWER -micrograms analyte/liter solution pptr simplified - ANSWER -nanograms analyte/liter solution buoyancy correction - ANSWER -m=(m'(1 -(air density/weight density)))/(1 -(air density/object density)) accuracy - ANSWER -closeness of the mean to the "true value" precision - ANSWER -reproducibility of individual measurements Uncertainty in Addition/Subraction - ANSWER -
e=sqrt(ex1^2+ex2^2+ex3^2+...) Uncertainty in Multiplication/Division - ANSWER -
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...) Significant Figures in Logarithms and antilogarithms - ANSWER -
the number of significant figures in the log should equal the number of digits in the mantissa How many significant figures in log(205.5) - ANSWER -four significant figures, so you will need four decimal places in your answer pH - ANSWER --log[H3O+] [H3O+] - ANSWER -10^-pH Absorbance - ANSWER --log(transmittance) Random Error - ANSWER --repeated measurements are sometimes high and sometimes low -cannot be corrected for Systematic Error - ANSWER --repeated measurements are usually always high or always low -can and should be corrected for Relative uncertainty= - ANSWER -absolute uncertainty/magnitude of measurement 68% of measurements in a Gaussian Curve will lie - ANSWER -
between the mean -1 and the mean+1
e=sqrt(ex1^2+ex2^2+ex3^2+...) Uncertainty in Multiplication/Division - ANSWER -
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...) Significant Figures in Logarithms and antilogarithms - ANSWER -
the number of significant figures in the log should equal the number of digits in the mantissa How many significant figures in log(205.5) - ANSWER -four significant figures, so you will need four decimal places in your answer pH - ANSWER --log[H3O+] [H3O+] - ANSWER -10^-pH Absorbance - ANSWER --log(transmittance) Random Error - ANSWER --repeated measurements are sometimes high and sometimes low -cannot be corrected for Systematic Error - ANSWER --repeated measurements are usually always high or always low -can and should be corrected for Relative uncertainty= - ANSWER -absolute uncertainty/magnitude of measurement 68% of measurements in a Gaussian Curve will lie - ANSWER -
between the mean -1 and the mean+1
