One person weighs out 211.3 mg of their product and transfers it to a 250 mL bea

Question

One person weighs out 211.3 mg of their product and transfers it to a 250 mL beaker. They add 10 mL of ethanol. After the sample is completely dissolved, they add 150 mL of water. This solution is quantitatively transferred to a 250 mL volumetric flask. The beaker is rinsed a few times with water, and each rinse is added to the flask. Water is added to bring the volume of the solution up to the250.0 mL line. The solution is mixed thoroughly during this process. This is Solution X.

The person uses a syringe to fill a 5.00 mL pipet with Solution X. This quantity is then transferred into a 100 mL flask. FeCl3-KCl-HCl is added to bring the volume of the solution up to the 100.0 mL line. The solution is mixed thoroughly during this process. This is Solution Y

Solution X is ______ times more concentrated than solution Y. ?

Explanation / Answer

Since we take 5ml of solution in syringe from solution X and then transfer into 100ml of flask to bring the volume upto 100 ml of line

Let the concentration of X be p

then the concentration of Y be

5ml * p+ 95 * 0 = 100*yp

yp = 5/100 = 0.05p

Hence Solution X/ Solution Y = p/0.05p = 20

Hence solution X is 20 times more concentrated than solution Y

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