Homework Help: chemistry

Posted by cara on Monday, May 25, 2009 at 4:55pm.

I asked this question earlier that drbob explained but i still do not really understand what to do. can you please make it clearer?

the average pH of healthy human blood is 7.4. how many moles of H+ ions are free in your blood. The average person has approx. 5 L of blood.

Responses

chemistry - DrBob222, Monday, May 25, 2009 at 12:45pm
I assume the question is asking simply to count the H^+ free (from the pH calculation) and NOT go through the bicarbonate equilibrium.
pH = -log(H^+).
Solve this for (H^+) which gives the hydrogen ion in moles/L, then multiply by 5 to obtain the moles in 5 L.

would the equation be 7.4= -log of what?

chemistry - DrBob222, Monday, May 25, 2009 at 5:09pm
Sure.
pH = -log(H^+).
7.4 = -log(H^+)
-7.4 = log(H^+)
(H^+) = 3.98 x 10^-8 moles/Liter.
3.98 x 10^-8 moles/L x 5 L = ?? moles (H^+).
Again, I have assumed that the problem is concerned only with the free hydrogen ions and not the small amount of H^+ that may come from the bicarbonate/CO2 system that acts as a buffer for the blood system.
chemistry - cara, Monday, May 25, 2009 at 5:30pm
oh ok...thankyou

Answer this Question

Related Questions

Chemistry - An unknown element reacts with bromine to give bromide, MBr3. If 2....
maths - trigonometry - I have my maths exam on Tuesday and cannot remember how ...
Chemistry - Hi DrBob, thanks for getting back to me on the earlier related ...
English Language - I asked this question earlier. I need to write 2 letters of ...
math - How many two digit numbers are there in base 5. I really don't ...
12th grade chemistry - Thanks for your answer DrBob. I am still stumped.The ...
Computer Science - I previously asked a mythical man question, and I still don&#...
DrBob - please answer below i have a question on something already asked thanks
Math - Mathmate, I really appreciate all your help regarding my composite ...
mgt - what is dependencies exist? Your question doesn't make any sense to me...

For Further Reading

First Name:
School Subject:
Answer: