Question

A wastewater sample contains 10-5.6 mmol/l of oh ions at 25

c. The ph of this sample is

Answer 1

OH- concentration : 10^-5.6 mmol/l = 10^-8.6 mol/l.

H+ concentration : 10^-14-(-8.6) = 10^-5.4 mol/l.

Therefore pH value : 5.4.

Answer 2

The pH of this sample is 5.4

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.

$pH=-\log [H^+]$

$pOH=log [OH^-]$

Given : $[OH^-]=10^{-5.6}mmol/L=10^{-8.6}mol/L$

$pOH=log [10^{-8.6}]=8.6$

$pH+pOH=14$

$pH=14-8.6=5.4$

Thus pH of this sample is 5.4

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