An aqueous solution has a measured hydronium‐ion concentration of at .

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

Problem

An aqueous solution has a measured hydronium‐ion concentration of 6.53×10−12 mol L−16.53\times10^{-12}\,\text{mol}\,\text{L}^{-1} at 25∘C25^{\circ}\text{C}. (a) Calculate the pH of the solution, reporting your answer to three significant figures. (b) Determine the hydroxide‐ion concentration in the solution without directly using KwK_w. Show how your answer is consistent with the pH value obtained in part (a). (c) State whether the solution is acidic, neutral, or basic at 25∘C25^{\circ}\text{C}, and justify your response numerically.

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