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 21 
 on: Yesterday at 11:51:19 PM 
Started by Craig65 - Last post by Craig65
1 mole of Benzene = 0.012802156497658 *100g = 1.2802156497658 mol

 22 
 on: Yesterday at 10:29:47 PM 
Started by AussieKenDoll - Last post by Borek
Yep. It is hard to tell what kind of answer is expected - OP seems to be at the very beginning of the GenChem course, yet the question is either advanced or ambiguous.

 23 
 on: Yesterday at 10:09:41 PM 
Started by AussieKenDoll - Last post by AWK
pH remains unchanged when the buffer is diluted slightly
This is a good approximation for relatively diluted solutions with low ionic strength only, but when you change ionic strength from 1.0 to 0.1 this rule may give even an unpredictable result.
Quote
the pH of the buffer reaches 7
This is not always true. A high dilution of some buffer solutions may result in exceeding the pH of 7.
Working with ionic strength ~0.1 M, a row error of 0.05 pH unit is obtained. Such an error is acceptable at the beginning of studying chemistry.
But using ionic strength 1.0 you are going up to advanced chemistry level.

 24 
 on: Yesterday at 08:56:12 PM 
Started by AussieKenDoll - Last post by AussieKenDoll
pH remains unchanged when the buffer is diluted slightly and at extreme dilutions, the pH of the buffer reaches 7!

 25 
 on: Yesterday at 04:58:04 PM 
Started by Traumatic Acid - Last post by Mitch
I think you only use the 65 kg to find the mass of drug (dose) you need to give.

 26 
 on: Yesterday at 04:10:47 PM 
Started by Traumatic Acid - Last post by Traumatic Acid
I think he was just abbreviating.
To calculate Vd you multiply the concentration of the drug per kg by the Vd.

Aaaaaaand as soon as I typed that I question my own answer again ???  ;D
If the patient is 65 kg then that is a conc of 5 mg /L  Theophylline?
therefore Cp = 5mg L / 500 L = 0.01 mg / L

I don't know which is correct now.

 27 
 on: Yesterday at 03:17:47 PM 
Started by Traumatic Acid - Last post by Mitch
Something seems off about Vd in the problem. The units of Vd should only be in Liters. I think your professor made a typo, but I think your answer is fine.

 28 
 on: Yesterday at 02:51:33 PM 
Started by Traumatic Acid - Last post by Traumatic Acid
Ahhh, yeah I get you.

I asked the exact same question on a different forum and a reply I got was:

"Vd should be in just liters, not L/kg. So your numbers are right, but the concentration will be in mg/L."

So 0.655 mg / L

Still seems a little low to me?

 29 
 on: Yesterday at 10:41:30 AM 
Started by jdover5199 - Last post by wildfyr
Azo dyes will by definition have N=N in them.

 30 
 on: Yesterday at 10:39:42 AM 
Started by Dielli - Last post by Borek
You have to show your attempts at solving the problem to receive help, this is a forum policy.

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