Question
The indicator ethyl red has $K_{\mathrm{a}}=3.8 \times 10^{-6} .$ Over what approximate $\mathrm{pH}$ range does it change color?
Step 1
The pKa is the negative logarithm (base 10) of the Ka value. In mathematical terms, this is represented as: \[pKa = -\log(Ka)\] Show more…
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