Question

The poh of windex window cleaner is 2.40, calculate the hydrogen ion and hydroxide ion concentration.

Answer 1

1. The hydrogen ion concentration [H+] is 2.51×10⁻¹² M

2. The hydroxide ion concentration [OH¯] is 3.98×10¯³ M

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

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

• pOH = 2.40
• pH = 14 - pOH = 14 - 2.4 = 11.6
• Hydrogen ion concentration [H+] =?

pH = –Log [H+]

11.6 = –Log [H+]

Multiply through by –1

–11.6 = Log [H+]

Take the anti-log of –11.6

[H+] = anti-log (–11.6)

[H+] = 2.51×10⁻¹² M

2. How to determine the hydroxide ion concentration, OH¯

• Hydrogen ion concentration [H⁺] = 2.51×10⁻¹² M
• Hydroxide ion concentration [OH¯] =?

[H⁺] × [OH¯] = 10¯¹⁴

2.51×10⁻¹² × [OH¯] = 10¯¹⁴

Divide both side by 2.51×10⁻¹²

[OH¯] = 10¯¹⁴ / 2.51×10⁻¹²

[OH¯] = 3.98×10¯³ M

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