What is the pH of a neutral solution at 25°C?

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Multiple Choice

What is the pH of a neutral solution at 25°C?

Explanation:
On the pH scale, neutrality at a standard temperature means the concentration of hydrogen ions equals the concentration of hydroxide ions. For pure water, the product of those two concentrations is Kw, which at 25°C is 1.0 × 10−14. If they are equal, each ion concentration is 1.0 × 10−7 M, so pH = −log10(1.0 × 10−7) = 7. This is why neutral water at 25°C has pH 7. Values like 0 or 3 indicate strong acidity (much higher H+), while 14 indicates a strong base (very low H+ and high OH−). Keep in mind that the neutral point can shift slightly with temperature, but at 25°C the neutral pH is exactly 7.

On the pH scale, neutrality at a standard temperature means the concentration of hydrogen ions equals the concentration of hydroxide ions. For pure water, the product of those two concentrations is Kw, which at 25°C is 1.0 × 10−14. If they are equal, each ion concentration is 1.0 × 10−7 M, so pH = −log10(1.0 × 10−7) = 7. This is why neutral water at 25°C has pH 7. Values like 0 or 3 indicate strong acidity (much higher H+), while 14 indicates a strong base (very low H+ and high OH−). Keep in mind that the neutral point can shift slightly with temperature, but at 25°C the neutral pH is exactly 7.

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