c$)$ Standard Addition Variable Volume Calibration Curve

i$.$ Use the following data and Excel to plot a standard addition variable volume

calibration curve. Use your curve to determine the concentration $($ppm$)$ of the

unknown sample.

ii$.$ Save your calibration curve as a PDF file and upload to eClass.

iii. Use the following additional information to complete the table below.

$V=$ total volume $($volume of standard $+$ sample$)$

$V_S=$ volume of standard added

$V_0=$ initial volume of sample $=50\mathrm{.}0mL$

$S_i=$ initial concentration of standard $=279ppm$

$I_{s+x}=$ signal measured for a sample containing unknown plus standard