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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)
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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