A chromatographyple extracts showed a peak (from an unknown substance) that could be a pesticide used during their production. Using a standard additions technique, increasing amounts of the pesticide were added to the purified apple extract and the area of the peak of the unknown substance was recorded in the table below. mg pesticide added / Peak area of the g apple unknown substance O 100 2 289 A 540 6 956 (a) Establish if the amount of pesticide added and the area of the chromatography peak were correlated with 95% confidence. (10 marks) (b) Quantify the mg of pesticide per gram of apple in the original sample where no pesticide had been added. (5 marks) (c) Briefly, discuss the reasons for selecting standard additions for quantitative analysis instead of standard series