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pH decreases as temperature increases. In pure water at 25 °C, the molar concentrations of [H3O+] and [OH-} are equal (the liquid is electrically neutral overall). Therefore, 25 °C is the only temperature we consider, unless otherwise stated.
Sandra Kim 2B wrote:What's the importance of saying that the solution is at 25 degrees celsius? I've seen it in a lot of problems on calculating pH and I was not sure why it specified that.
You'll learn more about this topic in Chem 14B when we learn about the effect of temperature on equilibrium. At 25 degrees Celsius, the pH of neutral water is 7. Changing the temperature actually changes the pH at which water is neutral! For now though, assume the temperature is 25 degrees Celsius.
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