## Question

###### 2 Using the data you obtained from the graph in the previous problem determine the concentration of cobalt (II) in 1.975 g sample of a substance, which was dissolved in water in a 100 mL volumetric flask and then diluted to the mark. For the absorbance of the cobalt solution from the flask a value of 0.55 was obtained. What is the percentage of cobalt in the unknown compound? Atomic mass of Co is 58.933.

2 Using the data you obtained from the graph in the previous problem determine the concentration of cobalt (II) in 1.975 g sample of a substance, which was dissolved in water in a 100 mL volumetric flask and then diluted to the mark. For the absorbance of the cobalt solution from the flask a value of 0.55 was obtained. What is the percentage of cobalt in the unknown compound? Atomic mass of Co is 58.933.

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