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Lecture 87 Titrations.notebook
1
July 26, 2012
Lecture 87 Titrations.notebook
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July 26, 2012
Lecture 87 Titrations.notebook
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July 26, 2012
Feb 159:44 PM
1When 0.250 mol of NaOH is added to 1.00 L of 0.100 M H3PO4, the solution will contain
A HPO42
B H2PO4
C PO43
D A and B
E A and C
Feb 159:47 PM
2A solution containing HF is titrated with KOH. At the end point of the titration the solution contains
A equal amounts of HF and KOH
B H2O, H+, OH, K+, F, and HF
C K+ and F
D KF and H2O
E K+, F, and H2O
Feb 159:50 PM
3If 50.0 mL of a 0.0134 M HCl solution is mixed with 24.0 mL of a 0.0250 M NaOH solution, what is the pH of the final mixture?
A 1.87
B 12.40
C 5.29
D 3.02
E 10.98
Feb 159:57 PM
4What ratio of the mass of Na2HPO4 (molar mass = 142) to the mass of NaH2PO4 (molar mass = 120) is needed to prepare a buffer with a pH of 7.4?
A 1.58
B 0.63
C 1.87
D 1.18
E 0.53
Lecture 87 Titrations.notebook
4
July 26, 2012
Feb 159:52 PM
5An indicator has a Ka of 6.4 x 106, the conjugate is red, and the conjugate base is yellow. At what pH will the solution be red?
A 5.2
B 5.5
C 4.0
D 4.7
E 6.4