# solution from stock

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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#### 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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