Chemistry (4th Edition)

Published by McGraw-Hill Publishing Company
ISBN 10: 0078021529
ISBN 13: 978-0-07802-152-7

Chapter 16 - Questions and Problems - Page 771: 16.34

Answer

(a) Acidic (b) Neutral (c) Basic

Work Step by Step

** 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.
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