For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations. x2 Ka = [НА] — х [HA] Classify these situations by whether the assumption is valid or the quadratic formula is required. Assumption is valid Quadratic formula is required Answer Bank [HA] = 0.005 M [HA] = 0.05 M [HA] = 0.005 M [HA] = 1 M [HA] = 0.05 M Ką = 1 × 10-5 Ką = 1 x 10–4 Ka = 1 x 10-4 Ka = 1 × 10-3 K = 1 × 10-3

Chemistry: Principles and Reactions
8th Edition
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Author:William L. Masterton, Cecile N. Hurley
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Chapter4: Reactions In Aqueous Solution
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Problem 23QAP
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For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations.
x2
x-
.2
[HА] — х
[HA]
Classify these situations by whether the assumption is valid or the quadratic formula is required.
Assumption is valid
Quadratic formula is required
Answer Bank
[HA] = 0.05 M
Ka = 1 x 10-4
[HA] = 0.005 M
Ka = 1 x 10-4
[НA] 3D 0.05 М
Ka = 1 × 10-3
[HA] =
= 0.005 M
[HA] = 1 M
Ką = 1 × 10-5
Ka = 1 × 10-3
Transcribed Image Text:For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations. x2 x- .2 [HА] — х [HA] Classify these situations by whether the assumption is valid or the quadratic formula is required. Assumption is valid Quadratic formula is required Answer Bank [HA] = 0.05 M Ka = 1 x 10-4 [HA] = 0.005 M Ka = 1 x 10-4 [НA] 3D 0.05 М Ka = 1 × 10-3 [HA] = = 0.005 M [HA] = 1 M Ką = 1 × 10-5 Ka = 1 × 10-3
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