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In the problems so far we considered that the Holman solution is made up by mixing the stock solutions in the proportions indicated. However, Holman solution can be made up in other ways.

Using the same six stock solutions, calculate what the starting concentration of each would be so that when 10ml of each stock solution is added to 200ml of distilled water the final solution has the same composition (concentration of ions) as Holman solution. Express your answers in molarity.

Solution	Conc in Holman soln.	Conc of stock solution (M)
NaCl	120 mM
KCl	5 mM
CaCl2	2.5 mM
MgSO4	1 mM
NaHCO3	25 mM
NaH2PO4	1 mM