At four laboratory solutions are described using different representations

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

Problem

At 25∘C25^\circ\text{C} four laboratory solutions are described using different representations. • Solution A: pH=2.70\text{pH} = 2.70 • Solution B: [OH−]=3.2×10−5 M[\text{OH}^{-}] = 3.2\times 10^{-5}\,\text{M} • Solution C: pOH=11.30\text{pOH} = 11.30 • Solution D: [H3O+]=6.0×10−10 M[\text{H}_3\text{O}^{+}] = 6.0\times 10^{-10}\,\text{M} Answer the following. (a) Convert each representation to pH, reporting values to two decimal places. (b) Rank the four solutions from most acidic to most basic, writing their letter designations in order. (c) State whether each solution is acidic, neutral, or basic at 25∘C25^\circ\text{C} and justify each choice with quantitative evidence. (d) Calculate the ratio [H3O+][OH−]\frac{[\text{H}_3\text{O}^{+}]}{[\text{OH}^{-}]} for Solution A and for Solution D. Explain how these ratios support your ranking in part (b).

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