Chemistry

Problem

A chemical waste repository contains four unlabeled aqueous samples maintained at

25^{\circ}\text{C}

. Analysis of each sample yields the following single piece of information. • Sample W:

\text{pOH}=8.15

• Sample X:

[\text{H}_3\text{O}^+]=1.3\times10^{-10}\;\text{M}

• Sample Y:

\text{pH}=12.04

• Sample Z:

[\text{OH}^-]=3.2\times10^{-2}\;\text{M}

a. Calculate the pH of each sample to two decimal places. b. Classify each sample as acidic, basic, or neutral at

25^{\circ}\text{C}

. Support every classification with appropriate quantitative evidence. c. If the temperature of the repository were raised to

60^{\circ}\text{C}

(where

K_w>1.0\times10^{-14}

), identify any sample whose classification might change even if its hydronium and hydroxide ion concentrations remained numerically constant. Provide a brief explanation.

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