Ch 8_113011_two slides revisited

Ch 8_113011_two slides revisited - 3 O + Initial 0.366 ----...

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How a Buffer Works–II After acid is added, all H 3 O + will react with available CH 3 COO - : Conc. ( moles ) CH 3 COOH (aq) + H 2 O (l) CH 3 COO - + H 3 O + Initial 0.025 ---- 0.025 0.012 Change +0.012 ---- -0.012 -0.012 Equilibrium 0.037 ---- 0.013 0 Equilibrium must then be reestablished: total vol = 0.101 L Conc. ( M ) CH 3 COOH (aq) + H 2 O (l) CH 3 COO - + H
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Unformatted text preview: 3 O + Initial 0.366 ---- 0.129 0 Change -x ---- +x +x Equilibrium 0.366 - x ---- 0.129 + x x [CH 3 COOH] [CH 3 COO-] [H 3 O + ] = K a x =1.8 x 10-5 x = 5.11 x 10-5 (0.366) (0.129) Assuming: 0.366 - x = 0.366 and 0.129 + x = 0.129 pH = -log( 5.11 x 10-5 ) = 4.29 After the acid is added!...
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Ch 8_113011_two slides revisited - 3 O + Initial 0.366 ----...

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