1/3 NS prepared from 23.4% NS: How much mL of NS and SWI?

by Sherri
(Raleigh, NC USA)

A liter of 1/3 NS is to be prepared from 23.4% concentrated sodium chloride solution and sterile water for injection. How many mL of each are to be used?

My textbook says the answers are 333 mL of NaCl and 667 mL of water. The closest I came to was 359 and 641.They are both 26 digits away from 333 and667. How do I find this 26 ? I am trying to find out how they get their answers.

Comments for 1/3 NS prepared from 23.4% NS: How much mL of NS and SWI?

Average Rating starstarstarstarstar

Click here to add your own comments


by: David

This is less complicated question than you think.

A liter of 1/3 NS is prepared from...

So first of all, you want 333mL of Normal Saline.

(A Liter = 1000 milliliters)

1/3 NS is 333mL.

Then the sterile water for injection (SWI) is the remaining 2/3 of the mixture

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Pharmacy Tech Math Questions.

Back to Home

[?]Subscribe To This Site
  • follow us in feedly
  • Add to My Yahoo!

Didn't find what you were looking for? Use the box below to search this entire site.

Custom Search

Recent Articles

  1. Apothecaries System

    Aug 17, 17 10:13 PM

    Apothecaries System of Weights and Measures for Pharmacy Technicians

    Read More

  2. Air Force Pharmacy Technician 4POX1

    Aug 17, 17 09:51 PM

    Air Force Pharmacy Technician 4POX1: Requirements, Training/Basic School, Mandatory Knowledge,

    Read More

  3. Days Supply Question: #90 Tramadol, 1 Tab by Mouth Every 6 Hours

    Aug 16, 17 11:27 PM

    If I have a script of 90 Tramadol and the sig says take one every 6 hours how many days supply is that? I'm coming up to like 22. Am I right? Answer:

    Read More