Many Metal Cations Produce Aqueous Solutions That Have a PH

question 82

Multiple Choice

Many metal cations produce aqueous solutions that have a pH different from 7. Which one of the following statements A-D about this phenomenon is not correct? If all are correct, respond E.

• A) For a given metal, the cation with the higher oxidation number will produce the more acidic solution, for example, Fe³⁺(aq) is more acidic than Fe²⁺(aq).
• B) The Lewis acidity of the cation is a good measure of its ability to produce an acidic solution.
• C) Small highly charged main group metal cations, such as Al³⁺, produce acidic aqueous solutions.
• D) Alkali metal cations, such as Na⁺ and K⁺, have a negligible effect on the pH of a solution.
• E) Statements A-D are all correct.

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