Question
A certain weak base has a K, of 8.70 x 10-7. What concentration of this base...
A certain weak base has a K, of 8.70 x 10-7. What concentration of this base will produce a pH of 10.147 concentration:
Answers
I have given the answer in three significant figures......if the answer does not match with the computer database due to significant figures then please comment below.......
ko for the weak base given - Ko = 8.70 x 10-7 a pkb = – log ko = - log (8.70 810-7) = 6.06 Let, concentration of weak base be = c m Now, pH of any weak base can be given by the equation - pH = 14 - 1 pk 6 + 12 loge a 10.14 = 14 - 12.6.06 + 1 loge : Given, pH = 10:14] a 10.14 = 14-3.03 + 1/2 loge a 10.14 = 10.97 + 1 log ca / log c = 10.14 - 10.97 a 1/2 loge = – 0.83 a logc = -1.66 a c = 10 -1.66 = 0.0219 [three significant - figures] Thus, the concentration of the weak base = 10.0219 M Aus
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