Measurements show that the ph of a particular lake is 4.0. what is the hydrogen ion concentration of the lake?
a. 4.0m c. 10^-4m
b. 10^-10m d. 10^4m

c. 10^-4M

Explanation:

pH measures the concentration of H+ ions in a solution. It's a scale and the value ranges from 1 to 14. 7 is a neutral pH, below 7 is acidic and more than 7 is basic.

pH = -log[H+] where [H+]= hydrogen ion concentration in Molarity (M)

Given pH =4 so,

4 = -log[H+]

[H+] = antilog(-4)= 10^-4 M

Hence, hydrogen ion concentration of lake = 10^-4 M

it takes hundreds of years to become stable.

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