Phosphate buffer solution is purchased as a(n) 2x stock solution. The solution is more concentrated than the working stock. If tasked with making 200 mL of a 1x solution of PBS, how many mL of the stock solution would be needed? Report your answer in standard decimal notation rounded to one decimal place. How many microliters of original sample are required to produce a final dilution of 103 in a total volume of 20 mL? 1 microliter is 10-6 L or 103 mL. • The dilution is equal to M2/M1

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