Interpreting spectral data. The graph shows the 1H-nuclear magnetic resonance chemical shift of the H 4 proton

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Interpreting spectral data. The graph shows the 1H-nuclear magnetic resonance chemical shift of the H4 proton on pyridine as a function of pH. Chemical shift is related to the environment of a proton in a molecule. If the environment changes, the chemical shift changes. Suggest an explanation for why the chemical shift changes between low pH and high pH. Estimate pKa for pyridinium ion (C5H5NH+).

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