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### Topic: 'Amounts of substance' i guess?  (Read 3059 times)

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#### xJax

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##### 'Amounts of substance' i guess?
« on: July 13, 2017, 08:51:36 PM »
Hi guys, can someone provide me a worked solution to this question. I've not learnt 'percentage solution' before:

"a 50kg patient requires 10mcg/kg/minute for 2 hours. this is to be delivered from a 0.1% solution, how much solution will they need in mL?".

Thank-you!
« Last Edit: July 14, 2017, 06:20:33 AM by Arkcon »

#### Arkcon

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##### Re: 'Amounts of substance' i guess?
« Reply #1 on: July 14, 2017, 06:19:39 AM »
Hi guys, can someone provide me a worked solution to this question. I've not learnt 'percentage solution' before:

High there, xJax:, I'd like to welcome you to the chemical forums.  But I'd like to remind you to read our Forum Rules{click}, you agreed to them when you signed up, and they apply to everyone: new students, seasoned professionals, and people who just need to know right now.  We like to see some effort from you.  Let's work together:

Quote
"a 50kg patient requires 10mcg/kg/minute for 2 hours. this is to be delivered from a 0.1% solution, how much solution will they need in mL?".

Thank-you!

The fractional percentage seems to be throwing you.  That's OK, that's the toughest part of this problem.  But work out the first bit for us -- 50 kg needs 10mcg (which means what?  This is jargon here, you must look up what it means, or just stick with the jargon and report it that way)/kg/min per 2hrs.  How much is that?
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

#### Vidya

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##### Re: 'Amounts of substance' i guess?
« Reply #2 on: July 27, 2017, 09:47:42 AM »
Hi guys, can someone provide me a worked solution to this question. I've not learnt 'percentage solution' before:

"a 50kg patient requires 10mcg/kg/minute for 2 hours. this is to be delivered from a 0.1% solution, how much solution will they need in mL?".

Thank-you!
Go like this
10mcg/Kg  = x mcg/ 50 Kg
Then convert it from one minute to 2 Hours ( 2 hours = 120 minutes)
0.1 % means 0.1mcg per 100 mL
use it to get the answer.

#### xJax

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##### Re: 'Amounts of substance' i guess?
« Reply #3 on: July 27, 2017, 11:28:17 AM »
I tried it and got 10mL as the answer. Is this correct?

#### Vidya

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##### Re: 'Amounts of substance' i guess?
« Reply #4 on: July 27, 2017, 01:06:18 PM »
Can you show me the calculations?