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How do you prepare 500 mL of 250 mM Tris base? (The molecular weight of Tris...

How do you prepare 500 mL of 250 mM Tris base? (The molecular weight of Tris base is 121.14 g/mol)

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Answer #1

Molarity = Moles/volume of solution in liter

  • Given molarity = 250 mM = 250/1000 M = 0.25 M
  • Volume = 500 ml = 0.5 L
  • Moles = 0.25 × 0.5 = 0.125

Moles = given mass/ molar mass

Mass of tried base required = 0.125 × 121.14 = 15.1425 g

Therefore to prepare 250 mM of 500 ml of Tried base solution, we mix 15.425 g of tried base in 500 ml of solution

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