A chemist prepares five separate samples of aqueous solutions at

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A chemist prepares five separate 100.0 mL100.0\,\text{mL} samples of aqueous solutions at 25 ∘C25\,^{\circ}\text{C}. The solutes and their initial molarities are given in the table.
SampleSolute (strong)C0C_0 (M)
1HCl\text{HCl}1.0×10−31.0\times10^{-3}
2HBr\text{HBr}1.0×10−71.0\times10^{-7}
3NaOH\text{NaOH}1.0×10−31.0\times10^{-3}
4Ca(OH)2\text{Ca(OH)}_25.0×10−45.0\times10^{-4}
5Pure water—
All strong electrolytes dissociate completely. (a) Calculate the pH of each sample, using appropriate significant figures. (b) Identify any sample that can be considered neutral to within ±0.05\pm0.05 pH units, and justify your choice. (c) Rank the remaining samples from strongest acid to strongest base, showing how the numerical pH values support your ordering.

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