Acid Base Questions from TBR

[afkari]

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Have two questions I need help on please:

6 0. Which change requires that the MOST titrant be added
to the solution?
A . Going from a pH < pKa1 to a pH > pKa2
B. Going from the first equivalence point to the
second equivalence point
C . Going from a pH > pKa1 to a pH <pKa2
D. Going from the initial point to the first equivalence
point

61 . If, after the addition of 5 mL of titrant, the pH of the
solution is less than the pKal of a diprotic acid, what
volume of titrant is required to reach the second
equivalence point from the fully protonated state?
A . Between 5 and 10 mL
B. Between 10 and 15 mL
C . Between 15 and 20 mL
D. More than 20 mL

 

[MLT2MT2DO]

Have two questions I need help on please:

6 0. Which change requires that the MOST titrant be added
to the solution?
A . Going from a pH < pKa1 to a pH > pKa2
B. Going from the first equivalence point to the
second equivalence point
C . Going from a pH > pKa1 to a pH <pKa2
D. Going from the initial point to the first equivalence
point

61 . If, after the addition of 5 mL of titrant, the pH of the
solution is less than the pKal of a diprotic acid, what
volume of titrant is required to reach the second
equivalence point from the fully protonated state?
A . Between 5 and 10 mL
B. Between 10 and 15 mL
C . Between 15 and 20 mL
D. More than 20 mL

61. As the titration gets to the first 1/2half equivalence point, pH=pKa1. Since the pH is lower than pKa1 we have yet to hit our first 1/2 equivalence point. Thus it would be D more than 20mL since to reach equivalence point 2 it would be 4*>5mL, (4 *1/2=2 equivalent).

60. Use the same line of thinking as #61.