Which of the following statements most correctly defines the isoelectric point? (a) The \( \math...

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Which of the following statements most correctly defines the isoelectric point?
(a) The \( \mathrm{pH} \) at which all molecular species are ionised and carry the same charge.
(b) The \( \mathrm{pH} \) at which all molecular species are neutral and are uncharged.
(c) The \( \mathrm{pH} \) at which half of the molecular species are ionised and the other half unionised.
(d) The \( \mathrm{pH} \) at which negatively and positively charged molecular species are present in equal concentration.
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