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August 22nd, 2017, 11:43 AM  #1 
Newbie Joined: Aug 2017 From: Australia Posts: 4 Thanks: 0  how to calculate two molarities in one solution
150 mL of a solution contains 250 mg of Magnesium Chloride B.P. (MgCl2.6H2O, M.Wt. 203.3). What mass of sodium chloride (NaCl, M.Wt. 58.5) must be added such that when 100 mL of the solution is mixed with water and made up to 250 mL, the final concentration of chloride is 12 mmol/L? 
August 23rd, 2017, 10:52 PM  #4 
Member Joined: May 2015 From: Australia Posts: 77 Thanks: 7 
Hey amas4ever, it's such a coincidence that we posted the exact same question! We probably are doing the same course at university. Are you doing pharmacy? How are you finding the pharmaceutical calculations?
Last edited by skipjack; August 23rd, 2017 at 11:29 PM. 

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calculate, molarities, solution 
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