Stock Solutions: Suppose you choose to prepare a stock solution of red dye #40 b

Question

Stock Solutions:
Suppose you choose to prepare a stock solution of red dye #40 by measuring 0.05 g of dye powder, and making a 100 mL dye solution with volumetric flask. What is the molarity of this stock solution (in mol/L)? (Hint: Convert mass of dye powder to the number of moles first using molar mass) Stock Solutions:
Suppose you choose to prepare a stock solution of red dye #40 by measuring 0.05 g of dye powder, and making a 100 mL dye solution with volumetric flask. What is the molarity of this stock solution (in mol/L)? (Hint: Convert mass of dye powder to the number of moles first using molar mass)
Suppose you choose to prepare a stock solution of red dye #40 by measuring 0.05 g of dye powder, and making a 100 mL dye solution with volumetric flask. What is the molarity of this stock solution (in mol/L)? (Hint: Convert mass of dye powder to the number of moles first using molar mass)

Explanation / Answer

number of moles = mass /molar mass
                                   =0.05 / 40
                                    =0.00125 mol

Volume =100 mL =0.1 L
Molarity = number of moles/ volume
                  = 0.00125/0.1
                    =0.0125 mol/L

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