## Chemistry (4th Edition)

** Remember, higher pOH values mean low basicity, and low pOH values mean high basicity. At 25$^{\circ}$: $pH + pOH = 14$ so $pOH = 14 - pH$ (a) If pOH is greater than 7, then: $14 - pH \gt 7$ $14 - 7 \gt pH$ $7 \gt pH$ $pH \lt 7$ - If pH is less than 7, and pOH is greater than 7: $pOH > pH$, so the solution is acidic. (b) $14 - pH = 7$ $pH = 14 - 7$ $pH = 7$ Therefore : $pH = pOH$: Neutral (c) $14 - pH < 7$ $7 < pH$ $pH > 7$ - If pH is greater than 7, and pOH is less: $pOH < pH$, so the solution is basic.