Guest guest Posted July 26, 2003 Report Share Posted July 26, 2003 This was question 123 on the PTCB practice test. I posted, How much 1:1000 stock solution is required to prepare 500 ml of a > 1:400 solution? Answer is 125 ml. I did make the mistake of omitting a zero. It should have been 1:4000 solution. So by doing it this way 500/4000 = 0.125 0.125/x =1/1000 =125ml I see now how to work out this type of problem. Thank you for your help. I do appreciate the time you took to answer my questions. Sandy Quote Link to comment Share on other sites More sharing options...
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