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How to take the log of an equation?

Why is the Henderson hasselbalch equation necessary for finding ph? Why can't u just take negative log of concentration of H+?

  • Answer:

    You have to put your question in context and use the equation properly. The HH equation is about finding the pH when you are making a buffer solution. It allows you to calculate the amount of the acid and conjugate base (or base and conjugate acid) you need to make your solution the desired pH. For finding the pH of a normal solution, you just have to measure the hydrogen ion concentration [H+] and plug it into the definition of pH: pH = -log[H+] It's always about the context.

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