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    If you have a 2 M stock solution of Tris Buffer, a 0.5 M stock solution of Magnesium chloride, and a bottle of crystalline sodium chloride. Use these reagents to make 500 ml of a solution containing 50 mM Tris, 5 mM of MgCl2, and 0.25 M sodium chloride.

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    https://brainmass.com/chemistry/stoichiometry/solution-from-stock-165513

    Solution Preview

    the volume of the final solution V = 500 mL = 0.5 liters.
    In the solution, there are c1 = 50 mM = 0.05 M Tris,
    c2 = 5 mM = 0.005 M of MgCl2,
    and
    c3 = 0.25 M NaCl.

    the moles of NaCl is n3 = V * c3 = 0.5 * 0.25 = 0.125 mol.
    The molecular mass of NaCl is 58.5 g/mol
    therefore, the mass of NaCl is
    m = 0.125 * ...

    Solution Summary

    It shows how to make the desired solution from the stock. The solution is detailed and has a '5/5' rating.

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