# Chapter 18 - Ionic Equilibria I: Acids and Bases - Exercises - The pH and pOH Scales - Page 743: 18

(a) pH = 0, pOH = 14: Acidic. (b) pH = 3.77, pOH = 10.23: Acidic. (c) pH = 7.167, pOH = 6.833: Basic. (d) pH = 10.03, pOH = 3.97: Basic.

#### Work Step by Step

- If pH > pOH, the solution is basic, if pH < pOH, the solution is acidic: (a) $pH = -log[H_3O^+]$ $pH = -log( 1)$ $pH = 0$ $pOH + pH = 14$ $pOH = 14 - pH = 14 - 0$ $pOH = 14$ (b) $pH = -log[H_3O^+]$ $pH = -log( 1.7 \times 10^{- 4})$ $pH = 3.77$ $pOH + pH = 14$ $pOH = 14 - pH = 14 - 3.77$ $pOH = 10.23$ (c) $pH = -log[H_3O^+]$ $pH = -log( 6.8 \times 10^{- 8})$ $pH = 7.167$ $pOH + pH = 14$ $pOH = 14 - pH = 14 - 7.167$ $pOH = 6.833$ (d) $pH = -log[H_3O^+]$ $pH = -log( 9.3 \times 10^{- 11})$ $pH = 10.03$ $pOH + pH = 14$ $pOH = 14 - pH = 14 - 10.03$ $pOH = 3.97$

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