Answer :
The original solution used to make the solutions for the standard curve was prepared by dissolving of 2.60g of CoCl₂(molar mass 130. g/mol) in water to make 100 mL of solution. The value of a concentration of the solution is 0.2 M.
The molarity is calculated as
Molarity=moles/volume(in L)
The number of moles for CoCl₂ is
moles=2.60 g×(1 mol/130. g)
moles=0.02 mol
The volume of a solution is 100. mL. Convert it into a litre
volume=100 mL×(1 L/1000 mL)=0.1 L
Plug all values in the formula
Molarity=(0.02 mol/0.1 L)
Molarity=0.2 mol/L
Molarity=0.2 M (∵M=mol/L)
Therefore, the concentration of a solution is 0.2 M.
Your question is incomplete but the complete question is
The original solution used to make the solutions for the standard curve was prepared by dissolving of 2.60g of CoCl₂(molar mass 130. g/mol) in enough water to make 100 mL of solution. What is the molar concentration of the solution?
To know more about molarity
https://brainly.com/question/19539305
#SPJ4
