Question 15.14: Determining Whether a Cation is Acidic or pH-Neutral Classif...
Determining Whether a Cation is Acidic or pH-Neutral
Classify each cation as a weak acid or pH-neutral (neither acidic nor basic).
(a) C_{5}H_{5}NH^{+} (b) Ca^{2+} (c) Cr^{3+}
(a) The C_{5}H_{5}NH^{+} cation is the conjugate acid of a weak base. This ion is therefore, a weak acid.
(b) The Ca^{2+} cation is the counterion of a strong base. This ion is therefore, pH-neutral (neither acidic nor basic).
(c) The Cr^{3+} cation is a small, highly charged metal cation. It is therefore, a weak acid.
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