(a)The sol\'n for adults should be 500.0 mg of amoxicillin per 5.0 ml. What is t

Question

(a)The sol'n for adults should be 500.0 mg of amoxicillin per 5.0 ml. What is the molarity of this sol'n?

I found this to be ~.27M.

Part B) How much amoxicillin would you need to use to make .5L of the sol'n in part (a)? (in grams)

Part C) In the pharmacy you only have a 2 L volumetric flask. Adjust your calculation in part (b), so you can use the 2 L flask you have available.

Part D) Once you make the 1 L stock sol'n, you would have to make a diluted sol'n for children use. Using the stock sol'n, prepare a 100 mL solution, which has half the original concentration, namely half the concentration calculated in part (a). In one sentence describe briefly the procedure, and show all your calculations.

____

Please explain how to do this for best answer.

Explanation / Answer

Molarity = number of moles/volume of solution in litres

molar mass of amoxicillin is 365.4

no of moles = 0.5/365.4 = 0.00136

Molarity = 0.00136/0.005 = 0.2736 M

Molarity is 0.2736

B

0.2736 = no of moles/0.5

no of moles = 0.1368 moles

So in grams it will be = 0.1368 * 365.4 = 50 grams

C

for 2 litres we will requires = 50*4 = 200grams

D

1litre stock solution will require 100 gram of amoxicillin.

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