# Alligations: A Question about 1/3 Normal Saline Solution and Sterile Water for Injection

by Sherri
(Raleigh, NC)

A liter of 1/3 NS is to be prepared from 23.4% concentrated sodium chloride solution and sterile water for injection. How many milliliters of each are to be used?What is 1/3? Can you walk me through this?The book says the answers are 333 mL of NaCl and 667mL of water. I can't figure out how they get this answer or how to get it. Can you please post my problem on your website? If you can't answer my question, maybe one of your visitors can.

### Comments for Alligations: A Question about 1/3 Normal Saline Solution and Sterile Water for Injection

Average Rating

 Rating Here is the REAL answer to your question. by: Anonymous Okay Pharma techs...here it is1/3 NS is 1/3 of NORMAL Saline. Normal saline is0.9%. In order to do the problem you must find out how much 1/3 of normal saline is. So...1/3 x 0.9 = 0.3% 0.9 is your high 0.3 is what you want 0 is the low because there is no saline in your diluent. 0.9 0.3 0.3 0 0.6 Total 0.90.3 x 1000mL 0.6 x 1000mL--- = 333.3 --- =666.70.9 0.9I hope this helps all the other people like me who struggled with this problem.

 Rating how do I set up tictactoe table (desired/on hand) by: Anonymous thanks for helping but you didn't tell me how to set up tic tac toe table (desired/on hand) using the 1/3 to obtain the 333 and 667?How do I set up ratio/proportion table ? I understand your reply to a certain extent but it was still sort of vague.Where do you get 1/2 from 1/3?I know you can use only distilled and sterile water.From what i've heard you calculate the water as 0%, I was trying to put .33 as 1/3 in tic tac toe table.Is there another percentage I should use/can use for 1/3?I apologize if this seems like a stupid question

 Rating Can someone answer/reply to this question already? by: Anonymous How is someone supposed to figure out how to set up the tic tac toe table or figure out how to solve this if nobody answers this question or replies to it?What is the point in anyone contributing math questions in first place if no one ever replies to their posts?It defeats the purpose of posting questions to begin with.This is very annoying.

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