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C401Ch15LN2

# C401Ch15LN2 - Chapter 15 Acids Bases and Aqueous...

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Chapter 15: Acids & Bases and Aqueous Equilibrium Part 2 pH Scale (a logarithmic scale) We have all heard of the proper pH of swimming pools or the normal pH of blood (or shampoo being pH adjusted), but what does it really mean? The pH scale is just a way of telling us how acidic (or basic) a solution is. The “p” stands for “the negative log of”, while the H stands for [H + ] So pH means the negative log of the hydronium ion concentration. Question: what is the pH of a sln with [H + ] = 6.67x10 -6 ? Take-Home Question : what is the pH of a sln with [H + ] = 1x10 -8 ? Sig Fig note for pH: When you take the pH of a [H + ] concentration, count how many sig figs are in the concentration, then you carry this many places after the decimal in your final pH. Example: If the [H + ] = 1.0x10 -3 , then the pH is 3.00. This is because there are 2 sig figs in the concentration. The 3 just reflects the power of ten so it doesn’t count for sig fig purposes.

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C401Ch15LN2 - Chapter 15 Acids Bases and Aqueous...

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