SDN calculations NAPLEX

[good_karma]

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Hi everyone,

I am practicing the very popular 120 SDN calculations, some of the answers/solutions provided seem not to be accurate to me. I was wondering if other students out there wanna discus or even post their own solutions. Any feedback is welcome!

Problem 12:

How many ml of the Dextrose 70% in Water Injection will you add to the sterile water?

The sterile water volume is 1000ml and I don't think we should use 1015ml - anyhow that is not the main error.

Here is my solution: Please compare to the one provided and give me your feedback

10%
10g in 100ml
X? in 1000ml
X= 100g is needed

We have the 70% Dextrose
70g in 100ml
100g in Y?
Y= 142.8 ml of 70% Dextrose

Alternative 1:

70% * Y? = 10% * 1000
Y= 142.8 ml of 70% Dextrose

Alternative 2: Alligation

70% 10 parts
10%
0% 60 parts

TOTAL PARTS 70 not 60

10 parts of 70 parts D70%
Y? 1000 ml

Y= 142.85 ml

 

[Abby Atwood]

I never looked at the SND calculations (to be honest, I’m not entirely sure what they are). I think your mistake is that total volume does not equal 1000 mL. The sterile water (6:7 parts) is 1000 mL.

Alternative 1:
(V1+1000) x 0.1 g/mL = g1
0.7 g/mL x V1 = g1
Substitute and solve for V1
V1 = 166.7 mL

Alternative 2:
alligation
D70W = 1:7 = V1
SW = 6:7 = 1000 mL
V1 = 1000 mL / 6 = 166.7 mL

I may be missing some information since I didn’t read the original question (for example, I don’t know how 1015 mL factors in)

 

[good_karma]

Thank you Abby for your reply.

I never looked at the SND calculations (to be honest, I’m not entirely sure what they are). I think your mistake is that total volume does not equal 1000 mL. The sterile water (6:7 parts) is 1000 mL.

Alternative 1:
(V1+1000) x 0.1 g/mL = g1
0.7 g/mL x V1 = g1
Substitute and solve for V1
V1 = 166.7 mL

Alternative 2:
alligation
D70W = 1:7 = V1
SW = 6:7 = 1000 mL
V1 = 1000 mL / 6 = 166.7 mL

I may be missing some information since I didn’t read the original question (for example, I don’t know how 1015 mL factors in)

 

[Rouelle]

Well I never looked at these SDN calculations either, but I seem to remember the NAPLEX calculation questions to be really easy. The book we used for our pharmacy math (Ansel) was more than enough preparation.

 

[good_karma]

Thank you. Did you take the new Naplex?

Well I never looked at these SDN calculations either, but I seem to remember the NAPLEX calculation questions to be really easy. The book we used for our pharmacy math (Ansel) was more than enough preparation.

 

[Rouelle]

Thank you. Did you take the new Naplex?

No

 

[Hamouda]

Hello guys ....
I just got into this website couldn't find the 120 calculation questions, kindly anyone of u send me the link so I can practice.
I just found out that I failed the naplex and got 66, I'm really pissed.
Thank you guys.

 

[good_karma]

Hello guys ....
I just got into this website couldn't find the 120 calculation questions, kindly anyone of u send me the link so I can practice.
I just found out that I failed the naplex and got 66, I'm really pissed.
Thank you guys.

I am sorry you didn't pass this time. Pls find attached the 120 Calculation Q.

 

[CetiAlphaFive]

I am sorry you didn't pass this time. Pls find attached the 12 Calculation Q.

I just noticed that link says 2006.

Are those going to help you guys on the "new" NAPLEX?

 

[willowwren]

Well I never looked at these SDN calculations either, but I seem to remember the NAPLEX calculation questions to be really easy. The book we used for our pharmacy math (Ansel) was more than enough preparation.

I have been looking all over for places to practice calculations as RxPrep suggests working on these an hour a day to get comfortable and quick to no avail. I COMPLETELY forgot about my Ansel calculation book (our school gives access to electronic books....but I bought the hard copy....lol) Between the book and the online access code I should be able to do this without a problem now. THANK YOU!! 🙂

 

[WiEiEzy]

I am sorry you didn't pass this time. Pls find attached the 120 Calculation Q.

Will this actually help with the most current Naplex ?

 

[janeto]

WHERE DID YOU FIND THE ANSWERS? I SAW THE 120 QUESTIONS, BUT NO ANSWERS ATTACHED.

 

[El Trombopag]

I never looked at the SND calculations (to be honest, I’m not entirely sure what they are). I think your mistake is that total volume does not equal 1000 mL. The sterile water (6:7 parts) is 1000 mL.

Alternative 1:
(V1+1000) x 0.1 g/mL = g1
0.7 g/mL x V1 = g1
Substitute and solve for V1
V1 = 166.7 mL

Alternative 2:
alligation
D70W = 1:7 = V1
SW = 6:7 = 1000 mL
V1 = 1000 mL / 6 = 166.7 mL

I may be missing some information since I didn’t read the original question (for example, I don’t know how 1015 mL factors in)

Agree with alternative #1 myself, though isn’t there a section on the Naplex somewhere about respecting significant digits? The “right” answer might be 170 or 200 mL. 😉.

 

[projektreverb]

Honestly didn't even look at the SDN 120 calculations. Used the RXPrep math and I think that overprepares you. Know how to do every problem in there and you're good.

 

[GrandTheftAutumn]

I did about half of the SDN calculation questions; NAPLEX questions are much easier.
If you have nothing else to study, you can do SDN calculations. Otherwise I don't think it's necessary.
Pretty much RxPrep is all you need. Didn't even do PreNAPLEX.