1: An unknown acid (0.596 g) was dissolved in approximately 50 mL of deionized water and titrated with a 0.250 M NaOH solution. When pH vs. Volume of NaOH (mL) added was plotted, the graph below was obtained. The unknown acid is: A) monoprotic B) diprotic C) triprotic
1: An unknown acid (0.596 g) was dissolved in approximately 50 mL of deionized water and titrated with a 0.250 M NaOH solution. When pH vs. Volume of NaOH (mL) added was plotted, the graph below was obtained.
The unknown acid is:
A) monoprotic
B) diprotic
C) triprotic
2: What is/are the pKa value(s) for this acid?
A) 3.0 and 4.7
B) 4.0 and 7.7
C) 7.7
D) 4.0
E) 4.4 and 11.0
3: The volume of NaOH needed to reach the first equivalence point is:
A) 30.0 mL
B) 26.0 mL
C) 15.0 mL
D) 12.5 mL
E) 19.5 mL
4: Calculate the number of moles of NaOH used to reach the first equivalence point.
A) 0.00750 mol
B) 0.00375 mol
C) 0.00650 mol
D) 0.00313 mol
E) 0.00488 mol
5: The molar mass of the acid is:
A) 86.9 g/mol
B) 104 g/mol
C) 66.8 g/mol
D) 116 g/mol
E) 159 g/mol
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