From the 0.200M CoCl2 stock solution, prepare a series of dilutions to produce a

Question

From the 0.200M CoCl2 stock solution, prepare a series of dilutions to produce a series of standard solutions. Use the 0.200M CoCl2 stock solution as your highest concentration standard solution. You will have 50 mL of stock solution to work with for diluting. You will need standard solutions with five different concentrations plus the blank to draw your calibration curve. All your standards must have absorbances above 0.1. Dilute your solution carefully using one 10mL pipet and one 25 mL graduated cylinder

Explanation / Answer

Preparaton of series of standard solution of CoCl2 starting with stock solution 50 ml of 0.2 M CoCl2

Method : Take certain volumes of stock CoCl2 solution in 50 ml volumetric flasks and dilute them with water to the mark

final CoCl2 concentration (M) = initial concentration (stock) x volume of stock/total volume

V stock soln. (ml)          water (ml)          Final CoCl2 soln. (M)

         20                               30                            0.08

         10                               40                            0.04

           8                               42                            0.032

           6                               44                            0.024

           5                               45                            0.02

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