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Unformatted text preview: From dissociation of H 2 SO 4 [H + ][SO 4 2] [HSO 4] K a2 = 1.2 x 102 = = (0.00300 + x)(x) (0.00300 x) No obvious approximation looks valid, so we must solve with the quadratic formula. 0 = x 2 + 0.015x 3.6 x 105 a = 1 b = 0.015 c = 3.6 x 105 x = b +  b 2 4ac 2a x = 2.10 x 103 [H + ] = 0.00300 + x = 0.00510 pH = 2.29 Note: Change in [H+] does not violate huge K a for 1 st dissociation: [H 2 SO 4 ] = 0. Small and highly charged cations produce acidic solutions in water . Examples: Al 3+ , Fe 3+ , etc. ....
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 Fall '11
 JOHN
 Proton, pH

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