Question

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of mc014-1.jpg ions in the solution?

Answer 1

The pH of the solution is a measure of the acidity of such solution. Acidity is the level of how much acid is present in a mixture and is associated with the concentration of hydronium ions. For pH, it is equal to the negative logarithm of the hydronium ion concentration. We use this to calculate for what was asked.

pH = - log [H+]
2.32 = - log [H+]
[H+] = 4.79x10^-3 M

Answer 2

The concentration of the hydrogen ions in the solution is 4.79×10¯³ M

What is pH?

pH is simply defined as the measure of the acidity and alkalinity of a solution. It can be obtained mathematically by the following equation:

pH = –Log [H+]

How to determine the hydrogen ion concentration, [H+]

From the question given above, the following data were obtained:

• pH = 2.32
• Hydrogen ion concentration [H+] =?

pH = –Log [H+]

2.32 = –Log [H+]

Multiply through by –1

–2.32 = Log [H+]

Take the anti-log of –2.32

[H+] = anti-log (–2.32)

[H+] = 4.79×10¯³ M

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