40 10 pts ka1 43 x 10 7 and ka2 56 x 10 11 h2co3

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Unformatted text preview: aving a pH of 7.40. (10 pts) Ka1 = 4.3 x 10-7 and Ka2 = 5.6 x 10-11 H2CO3 ⇄ H+ + HCO3- 5. Methyl red is an indicator used in titrations and has a Ka equal to 7.9 x 10-6. At what pH will this indicator change colors? Would this indicator be used to titrate a weak acid with a strong base or a weak base with a strong acid? What is the color of this indicator a pH 4.6? (10 pts) HIn ⇄ H+ + In(Red) (Yellow) The indicator changes colors at pH = pKa = -log(7.9 x 10-6) = 5.1 This indicator is used for a weak base –...
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This document was uploaded on 03/19/2014 for the course CHEMISTRY 102 at Los Angeles Harbor College.

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