Guest guest Posted July 23, 2002 Report Share Posted July 23, 2002 Hi Mike/Anita- Just in case the whacky computer artifacts in J's response to questions 3 and 4 confused you I'll answer questions 3 & 4 again. 3. What volume of 5% sodium hypochlorite is required to prepare 1 L if 0.1% sodium hypochlorite disinfecting solution? A: Use the Percent Solutions Formula total vol. required...............x=volume needed __________________........=.....__________________ % on hand..........................%wanted 1000ml.............X.......... _________...=...__________ 5%.................0.1% x=20ml of the 5% sodium hypochlorite is needed. (add 980ml of water or solution of choice for a final volume of 1000ml) *************************************************************** 4. What volume of 36% trichloroacetic acid solution is needed to prepare 120ml of 10% trichloroacetic acid? A: solve this in the same manner as shown above. 120ml................X..... __________..=..______________ 36%...............10% X=33.33 ml (add 86.67 mls of water or solution of choice for a final volume of 120ml) Hope this helps. Dora > > Hi Guys > Thanks for putting up with all the questions I've had. Normally I would be asking my pharmacist. But I have been off on medical leave these last few weeks with my son. I was feeling pretty confident until I took the on line test at PTCB. Thanks for all the great stuff that was posted yesterday. These following have me stumped. Can any one help. Percents were barely covered in the book that I bought. And percents are driving me crazy. Thanks mcorbus > > A TPN order that includes folic acid 2mg/L is filled using a stock vial that delivers 5mg/ml. What volume of injection will be used to prepare a 2500ml TPN bag? > > What amount of 50% magnesium sulfate solution should be injected to prepare an IV bag containing 2g MgS04? > > What volume of 5% sodium hypochlorite is required to prepare 1 L if 0.1% sodium hypochlorite disinfecting solution? > > What volume of 36% trichloroacetic acid solution is needed to prepare 120ml of 10% trichloroacetic acid? > > A tech has been given 100ml of a 10% acetic acid solution. The pharmacist asks the tech to dilute the solution to 500ml with sterile water and to label the solution. What percent should appear on the label? > > Thanks again. > > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted July 24, 2002 Report Share Posted July 24, 2002 ARRRGGG!! Blasted advertisement messed up my formula structure. Hopefully the second example clarified things. Here's another way to look at it: the % you want multiplied by the Volume required,divided by the % you have on hand = the volume of the % on hand you will need. What volume of 5% sodium hypochlorite is required to prepare 1 L > if 0.1% sodium hypochlorite disinfecting solution? 0.1(%) x 1000(ml)/ 5(%)= 20(ml) You'll need to use 20ml of the 5% sodium hypochlorite. Dora > Hi Mike/Anita- > Just in case the whacky computer artifacts in J's response to > questions 3 and 4 confused you I'll answer questions 3 & 4 again. > > 3. What volume of 5% sodium hypochlorite is required to prepare 1 L > if 0.1% sodium hypochlorite disinfecting solution? > A: Use the Percent Solutions Formula > > total vol. required...............x=volume needed > __________________........=.....__________________ > % on hand..........................%wanted > > > 1000ml.............X.......... > _________...=...__________ > 5%.................0.1% > > x=20ml of the 5% sodium hypochlorite is needed. (add 980ml of water > or solution of choice for a final volume of 1000ml) > > > *************************************************************** > 4. What volume of 36% trichloroacetic acid solution is needed to > prepare 120ml of 10% trichloroacetic acid? > > A: solve this in the same manner as shown above. > > 120ml................X..... > __________..=..______________ > 36%...............10% > > X=33.33 ml (add 86.67 mls of water or solution of choice for a final > volume of 120ml) > > Hope this helps. > Dora > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted April 11, 2010 Report Share Posted April 11, 2010 I will be taking my exam April 24th I have come across the following math questions and can not figure them out. How much of a D20W 1000ml and D5W 1000ml is needed to make a D8.5W 400ml? The answer is: 93.3ml / 306.7ml Also, this question: A physician writes an order for Aminosyn 2.5% 500ml, you look on the shelf and have only 8.5% 1000ml. How are you going to prepare this order using a sterile evacuated container? The answer is: Add 147ml of Aminosyn 8.5% and qs with sterile water to 500ml I would appreciate any help I can get with these two problems, Thank You Quote Link to comment Share on other sites More sharing options...
Guest guest Posted April 11, 2010 Report Share Posted April 11, 2010 Dear " mkw_texas " , The following Tutorial that I posted many years ago, will best explain how to solve this type of problem. The site forum can not accept the diagram that is needed to solve this problem using alligation method. Here is the directory and the link to the Math Only file that contains the Alligation method: Files > 5- Tutorial-1 & Study Information > S 8- Math Tutorials Only > 4. Alligations > Alligation II http://f1.grp.fs.com/v1/UDjCS-H0hO-tFAW60klIjqi-47OKJF8mbmHOsMUIZDtPAYNzoxS\ 8LhZ-P5QRoraimnB4aY_me7yr6SNk2Noc/5-%20Tutorial-1%20%26%20Study%20Information/S%\ 208-%20Math%20Tutorials%20Only/4.%20%20Alligations/Alligation%20II/1.%20%20Tutor\ ial%20-%20Alligation%20II%20Updated%20Word%20Copy.doc The first problem you posted will need to be solved by Alligation II, however the second problme can be solved by Alligation #1 or %1 x Qty 1 = %2 x Qty (which you may see written with different symbols to mean the same thing). The answers given in your book or source are correct. The second question can be solved using the alligation method #1 Files > 5- Tutorial-1 & Study Information > S 8- Math Tutorials Only > 4. Alligations > Alligation I /files/5- Tutorial-1 %26 Study Information/S 8- Math Tutorials Only/4. Alligations/Alligation I / 1. Tutorial - Alligation I Updated Word Copy .doc Updated word document of the original copy of simple Alligations I that was posted in September 2003. http://f1.grp.fs.com/v1/UDjCS4GEi3StFAW6M5lAnSsc2jbk50md9pP8QvXOIk00pJOgor5\ jQ-rvfx3nOQPlrlyutzi9a6naE6rlaz7n/5- Tutorial-1 %26 Study Information/S 8- Math Tutorials Only/4. Alligations/Alligation I /1. Tutorial%2 %1 x Qty 1 = %2 x Qty 2.5% X 500ml = 8.5% x V2 2.5% X 500ml----8.5% x V2 ------------ = ---------- 8.5%------------8.5% 2.5 X 500ml ------------ = V2 8.5 147.06 ml of 8.5% solution. Place in the evac bottle and add enough water to make 500ml. OR subtract 147.06 from 500 and you will get the EXACT amount of ml of water to add. Hope this helps, Jeanetta Mastron CPhT BS Founder/Owner of this site > > I will be taking my exam April 24th I have come across the following math questions and can not figure them out. > > How much of a D20W 1000ml and D5W 1000ml is needed to make a D8.5W 400ml? The answer is: 93.3ml / 306.7ml > > > Also, this question: A physician writes an order for Aminosyn 2.5% 500ml, you look on the shelf and have only 8.5% 1000ml. How are you going to prepare this order using a sterile evacuated container? The answer is: Add 147ml of Aminosyn 8.5% and qs with sterile water to 500ml > > > I would appreciate any help I can get with these two problems, Thank You > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted April 11, 2010 Report Share Posted April 11, 2010 While being logged into the study site you will have to copy and paste the second link into your own browser, as it did not come out totally active or highlighted. Jeanetta Mastron CPhT BS Founder/Owner > > > > I will be taking my exam April 24th I have come across the following math questions and can not figure them out. > > > > How much of a D20W 1000ml and D5W 1000ml is needed to make a D8.5W 400ml? The answer is: 93.3ml / 306.7ml > > > > > > Also, this question: A physician writes an order for Aminosyn 2.5% 500ml, you look on the shelf and have only 8.5% 1000ml. How are you going to prepare this order using a sterile evacuated container? The answer is: Add 147ml of Aminosyn 8.5% and qs with sterile water to 500ml > > > > > > I would appreciate any help I can get with these two problems, Thank You > > > Quote Link to comment Share on other sites More sharing options...
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