ratio, stock, stock solution

by Georgette
(Charleston, SC, USA)

How much of a 1:1000 stock is needed to make 360 ml of a 1:2400 solution?

Comments for ratio, stock, stock solution

Average Rating starstarstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar 		Answer: 3600mL of original stock solution and 150mg of solute
by: David

Thank you for the question, Georgette!

So we are starting with a 1:1000 stock solution, which is the same as = 0.1% Strength

We want to end up with a 360mL of a 1:2400 stock solution.

This is the same as a 0.0416% Strength.

How do we get to the answer?

We are going from a higher concentration (1:1000) to a lower concentration (1:2400).

The question now is, how much sterile water are we going to add to make this to the correct concentration?

In order to figure out how much diluent we will have at the end, we will multiply the volume (given, 360mL) by the percentage strength (given, 0.416%) which gives us 14.9999999, which we will round for simplicity's sake to 15mg.

So now we have some known variables and one unknown variable:

How much mixture (in mL) will we need at 0.1 percentage strength to equal 15mg in 360mL?

0.1% 15mg
------ = -----------
X mL 360 mL

Cross multiply...

360mL X 0.1% = X mL X 15mg

360mL X 10 = 15mL X XmL

3600 = 15mL X 240 mL

150mg 15mg
----- = ---------
3600 360

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
  • XML RSS
  • 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

RSS

  1. Prior Authorization Rejection

    Apr 10, 18 11:13 PM

    This page covers what a Prior Authorization is and why it happens.

    Read More

  2. My 10 yr olds prescription -- Is The Following Situation a HIPPA Violation?

    Apr 10, 18 10:00 PM

    I know someone who is a pharmacy tech. My 10yr.olds medication was called into the pharmacy she works at. Her daughter and my daughters have an on-off

    Read More

  3. My Pharmacy told my mom that I didn't pick up my meds. Is this a Hippa Violation?

    Apr 10, 18 09:26 PM

    My pharmacy told my mom I didn't pick up my meds. Yes, I do have same last name but I have a different address; for all they know, that wasn't my mom.

    Read More

  4. Vitamin Resources

    Apr 08, 18 02:43 PM

    Vitamin Resources - Information about Vitamin A, The B Vitamins, Vitamin C, and Vitamin D.

    Read More

  5. Two HIPPA Questions: Including, Can Pharmacy Techs counsel patients?

    Mar 27, 18 10:20 PM

    under the hippa law can a pharmacist and a pharmacy tech speak about a clients medical record amongs each other and cam pharmacy techs counsel the patient

    Read More

  6. Should pharmacy errors be reported anywhere?

    Mar 27, 18 10:11 PM

    Our pharmacy manager wants us to report any pharmacy error that happens. Why is it important to report errors? Where should we report the errors to?

    Read More

  7. Former employee working for competitor; Enticing former customers to new pharmacy

    Mar 27, 18 09:32 PM

    We had a pharmacy tech resign, then go to work at a grocery/pharmacy - the tech has used PHI to target our patients and entice them to transfer their prescriptions.

    Read More

  8. Wondering how many Percocet I should have left in my bottle?

    Mar 27, 18 08:57 PM

    I got my 120 Percocet Feb 18 how many should be in my bottle March 16 i take 4 a day

    Read More

  9. If my pharmacist states the name of my medication very loudly at pickup, is that a Hippa violation?

    Mar 27, 18 08:32 PM

    Is it a HIPAA violation if a pharmacist says what you are taking very loud so others can hear what you are taking?

    Read More

  10. Is Publicly mentioning the name of the drug the patient is on a HIPPA violation?

    Mar 20, 18 08:53 PM

    If the name of the drug is mentioned in order to further assist the patient with getting them the medication, is this a violation of hipaa?

    Read More

  11. Osmolarity/Hospital Potassium Infusion problem (3 Part Question)

    Mar 20, 18 08:43 PM

    At 3:00 P.M., a pharmacist received an order to add 30 mEq/L of potassium chloride to the already running intravenous fluid for a patient. After checking

    Read More

  12. SILICONE RINGS IN A CLEAN ROOM

    Mar 20, 18 08:39 PM

    The USP797 rules state that no jewelry can be worn in the I.V. clean room setting because it wouldn't be sterile. I was wondering if silicone rings would

    Read More

  13. What is a "Root Cause Analysis"? And how does a pharmacy create "healthy safety culture"?

    Mar 20, 18 08:38 PM

    Recently there was a wrong-drug mistake at the pharmacy I'm employed at as a technician. One of my tech friends (who works at a different pharmacy) asked

    Read More

  14. Liquid Morphine: How many days will my meds last?

    Mar 20, 18 08:32 PM

    I am a post surgical patient I am on liquid morphine 22ml bottle. I’m allowed to take 2ml every 3 hours how many days should by bottle last?

    Read More

  15. 1ml inject once a week 10 week supply

    Mar 20, 18 08:26 PM

    how many day supply is it?

    Read More