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