## exam math questions

by Brittany
(TX)

Hey guys, I finished the pharm tech program at the end of may and have been studying since then for the certification exam (which i take tomorrow). I somewhat understand the solution dilution and concentration and proportion problems but I have problems when I read the question as to which formula to use? I have a few example questions from the mosby's practice CD if I put them on here could someone show me step by step how to solve? Also are there any hints as to how to figure out which formula to use for a problem?

How many ml's of water must be added to 250ml of a 0.9% w/v stock solution of sodium chloride to prepare 1/2 NS solution?

How many ml's of a D10W solution contain 100g of Dextrose?

What is the % strength of a solution that is made by adding 100ml of water to 600ml of a 25% solution?

How many grams of zinc oxide would contain 10g of zinc oxide?

## Comments for exam math questions

 Aug 08, 2011 MATH EQUATION by: Anonymous HOW MANY GRAMS OF 20 PERCENT OF ZINC OXIDE OINTMENT,WOULD CONTAIN 10 GRAMS OF ZINC OXIDE

 Mar 23, 2011 exam math questions by: Anonymous How did you get 2.25g? When I multiply 0.9 by 250 I get 225g. Am I missing something?

 Jul 07, 2010 3RD QUES ANS by: Anonymous What is the % strength of a solution that is made by adding 100ml of water to 600ml of a 25% soluTION. U WILL FIND GRAMS OF SOL... SO X/600=25/100 X=150GSO THE TOTAL RATIO COMES LIKE 150G/700ML BY ADDING 100ML OF WATER INTO 600MLTOTAL % COMES BY 150/700=X/100 X=21%

 Jul 07, 2010 2ND QUES ANS by: Anonymous How many ml's of a D10W solution contain 100g of Dextrose? ANS IS AS FOLLOWD10W MEANS IT IS 10% SOL. THAT MEANS IT IS 10G/100MLSO 100G/X=10/100 X=1000ML OR 1L

 Jul 07, 2010 IST QUES. ANS. by: Anonymous How many ml's of water must be added to 250ml of a 0.9% w/v stock solution of sodium chloride to prepare 1/2 NS solution? answer is as follow... X/250=0.9/100 X=2.25G 2.25/X =0.45/100(1/2 NS SOL) X =500 TOTAL WATER NEEDED = 500-250=250

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