Calculate the hydrogen ion concentration in the following biological fluids whose pH are given below:

A. Human muscle-fluid, 6.83


B. Human stomach fluid, 1.2


C. Human blood, 7.38


D. Human saliva, 6.4.


a) Human muscle fluid 6.83:

pH = 6.83


pH = – log [H+]


6.83 = – log [H+]


[H+] =1.48 × 10–7 M


(b) Human stomach fluid, 1.2:


pH =1.2


1.2 = – log [H+]


[H+] = 0.063


(c) Human blood, 7.38:


pH = 7.38


pH = log [H+]


[H+] = 4.17 × 10–8 M


d)Human saliva, 6.4:


pH = 6.4


6.4 = – log [H+]


[H+] = 3.98 × 10–7


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