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At the extreme limits (high and low end) of the plot of pH vs. log([HPO42-]/[H2PO4-]), the...

At the extreme limits (high and low end) of the plot of pH vs. log([HPO42-]/[H2PO4-]), the data points may appear as though they are leveling off. Think about the [HPO42-]/[H2PO4-] ratio at the extreme limits and explain why this leveling off occurs. (There is one other answer on Chegg but I do not understand the logic of that response) Thank you!

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