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Question: the recommended procedure for preparing a very dilute solution is...

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The recommended procedure for preparing a very dilute solution is not to weigh out a very small mass or measure a very small volume of stock solution. Instead, it is done by a series of dilutions. A sample of 0.6945 g of KMno4 was dissolved in water and made up to the volume in a 500.0-mL volumetric flask. A 2.000-mL sample of this solution was transferred to a 1000-mL volumetric flask and diluted to the mark with water. Next, 10.00 mL of the diluted solution was transferred to a 250.0-mL flask and diluted to the mark with water. (a) Calculate the concentration (in molarity) of the final solution. Enter your answer in scientific notation. x 10 M (b) Calculate the mass of KMno4, needed to directly prepare the final solution. Enter your answer in scientific notation. x 10 g

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