Question

(e) Calculate pH of 2N HCl solution at 298 K
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Answer 1

pH of HCl = 0.1

Explanation:

To calculate the pH of HCl you need to know the concentration expressed in molarity (mol HCl/L solution). You will use the following equation to find the pH.

pH = -log[H+]

This means you take the negative log of the hydrogen ion concentration to find the pH.

The hydrogen ion concentration is the same as the concentration of the acid because HCl is a strong acid and dissociates as follows:

HCl -> H+ + Cl- (notice the 1:1 ratio of HCl and H+)

A 1M HCl solution has a pH of 0

So, number of electrons exchanged is one per Chlorine atom. And one unit formula of HCl contains one Chlorine. So, total exchange is one. Hence, n-factor is one.

normality = molarity * n-factor

2 = molarity * 1

Therefore Molarity = 2M

pH of 2M HCl = 0.1

Answer 2

Answer:

0.1

Explanation:

because the molarity is 2

ph of 2M of HCl Is 0.1

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