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?
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.
oh ok...thankyou
To calculate the number of moles of H+ ions in your blood, you can use the formula pH = -log(H+). The average pH of healthy human blood is 7.4.
To solve for (H+), you need to rearrange the equation.
First, take the antilog of both sides of the equation. This will get rid of the negative sign and leave you with 10^(-pH) = H+.
Next, plug in the pH value of 7.4 into the equation, giving you 10^(-7.4) = H+.
Now, you can use a calculator or scientific notation to calculate the value of 10^(-7.4), which is approximately 3.98 x 10^(-8).
This value represents the concentration of H+ ions in moles per liter (M). Since the average person has approximately 5 liters of blood, you can multiply the concentration by 5 to find the total number of moles in 5 liters.
Therefore, the number of moles of H+ ions in your blood would be (3.98 x 10^(-8)) moles/L x 5 L = 1.99 x 10^(-7) moles.
So, there are approximately 1.99 x 10^(-7) moles of H+ ions free in your blood.