The pH scale | Acids and bases | AP Chemistry | Khan Academy

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The pH scale is a convenient way to represent the acidity or basicity of a solution. We can calculate the pH of a solution by taking the negative logarithm of the hydronium ion concentration, or pH = -log[H₃O⁺]. At 25°C, a solution with a pH less than 7 is acidic, a solution with a pH greater than 7 is basic, and a solution with a pH equal to 7 is neutral. View more lessons or practice this subject at www.khanacademy.org/science/a...
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the explanation of how to ball park a pH without a calculator is gold
thank you!

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