A set of five working standards covering the range from 1.00 ppm to 100.0 ppm Cl

Question

A set of five working standards covering the range from 1.00 ppm to 100.0 ppm Cl` (set: 10.0ppm, 20.0 ppm & 50.0 ppm) are to be prepared from a stock solution prepared by dissolving 1.998 g of NaCl in distilled water and diluting to volume in a 100-mL volumetric flask. Determine the concentration of the stock solution and make a table of the dilution scheme required to make the working standards. Calculate the actual concentration of the working standards. You have only 1-5 mL and a 10 mL pipettes and an unlimited supply 5, 10, 25, 50,100 mL volumetric flasks.

Use illustrations please.

Explanation / Answer

concentration of the stock solution=1.998/100gm/gm=0.01998

for 10 ppm solution

required concentration =10^-5gmgm

stock taken= 1ml water taken=1999ml   

for 20ppm solution

required concentration=2*10^-5gm/gm

water added=1ml water taker=999ml

for 50ppm solution

required concentration=5*10^-5gm/gm

water added=5ml water taken =1995ml

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