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Study Quiz 3
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1
Which of the following equations best represents a neutralization reaction?
A)Ba(SO4)2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaOH(aq)

B)CH3COOH(aq) + NH3(aq) → CH3COO–(aq) + NH4 + (aq)

C)Cl2(g) + H2O(l) → HOCl(aq) + HCl(aq)

D)P4(s) + 3OH–(aq) + 3H2O(l) → PH3(g) + 3H2(g) + 3H2PO2–
2
Identify the salt in the following reaction.

KOH(aq) + HBr(aq) → H2O(l) + KBr(aq)

A)KOH
B)HBr
C)H2O
D)KBr
3
What volume of a 0.115 mol/L solution of HCl(aq) is required to completely neutralize a 25.0 mL sample of 0.138 mol/L KOH(aq)?
A)30.0 mL
B)3.00 mL
C)20.8 mL
D)2.08 mL
4
An indicator
A)changes colour over a pH range
B)is usually a weak acid that changes colour when it loses a proton
C)should be chosen so that its colour changes over a pH range that includes the pH at the equivalence point of the titration
D)All of the above are true.
5
An acid-base titration curve plots
A)the pH of a solution against the total volume of an added acid
B)the pH of a solution against the volume of an added acid or base
C)the pH of a solution over time
D)the pH of a solution containing buffers
6
The end point in a titration occurs
A)when the acid and base present completely react with each other
B)when the solution has a pH equal to 7
C)when the indicator changes colour
D)when the pH of the solution no longer changes
7
Why is phenolphthalein not a good indicator to use for a titration that has a pH of 6.0 at the equivalence point?
A)Its colour changes too far past the equivalence point.
B)Its colour changes too far before the equivalence point.
C)Its colour change is too difficult to see.
D)The question is incorrect. Phenolphthalein is a good indicator choice.
8
Acid A is titrated to the end point with Base B. At the end point the pH is 8.80. What can you conclude about the nature of A and B?
A)A is a strong acid and B is a strong base.
B)A is a strong acid and B is a weak base.
C)A is a weak acid and B is a strong base.
D)A is a weak acid and B is a weak base.
9
The titration curve for the titration of a weak polyacid HxA with the base NaOH will
A)show x – 1 equivalence points
B)show x equivalence points
C)show x + 1 equivalence points
D)show decreasing pH values as the titration proceeds





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