A student is testing to see if a particular protein powder really contains the a

Question

A student is testing to see if a particular protein powder really contains the amount of whey protein it is advertised to contain. He wants to first make a fairly dilute 20% powder to test using Biuret reagent How would he go about making 150ml of this % test solution from powder? solution of this O A. Add 20g of protein powder to 150ml water B. Add 30g of protein powder to a beaker and bring volume up to 150ml with water C. Add 20g of protein powder to a beaker and bring volume up to 100ml with water. Then dilute this solution to 150ml. D. Add 40g of protein powder to a beaker and bring volume up to 100ml with water. Then dilute this solution by adding 50ml of water

Explanation / Answer

Answer is option B.

Student has to prepare a 20% dilute solution of protein powder for testing purpose. He has to make 150 ml of this test solution.

20 /100 is the conc of protein powder required. (20% or 20 part in 100)

Amount of protein powder he has to take to reconstitute in water is x or conc is x gm / 150 ml.

20 / 100 = x / 150  

x = (20 x 150)/ 100

x = 30 g.

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