Hi there! Could you please help me with the following question with the answers.

In the method of Standard Addition, several identical samples of the unknown are treated with graduated known additional amounts of analyte. The signal for the resulting series of solutions is plotted versus the known standard concentration. A linear relation should be observed in which the concentration of the unknown will correspond to the negative of the x-intercept. Read: Harrls, D.C., Quantitative Chemical Analysis, Section 5-3 - "Standard Addltlon" For example, suppose we have a solution containing an unknown concentration of the ion Ca2+, and a standard Ca2+ solution of concentration 10.0 pg/mL. Into each of eight 50.0 mL volumetric asks we pipette Vu =5.00 mL of unknown solution plus the various volumes of standard solution, indicated by Vs below. The solution in each ask is diluted to the mark. Each resulting solution is subjected to an analytical technique which produces the signals shown in the following table: or: NH hm ON 9 . N to N 9.0 01-5 H01 00 mvsmu -_ -EE:- _E- _E- -m- _El -E- _- P 01 u A Use linear regression analysis to determine the concentration of Ca2+ in the unknown solution as follows: Construct a plot of Signal versus (the undiluted Standard concentration (ug/mL) times the ratio of the dilution factors) by entering the appropriate values of 10.0>