Question 1

Propionic acid (CH3CH2COOH)has a Ka = 1.3 × 10-5 and phosphoric acid (H3PO4)has a Ka = 7.5 10 -3.Write the conjugate base for each.Which one is the stronger base?

Accepted Answer

Propionate - CH₃CH₂COO^1-;Dihydroge

Question 2

Match the following.
-Arrhenius theory

Accepted Answer

A) the species that results when a base accepts a proton 
B) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
C) a theory that treats acid-base reactions as proton-transfer reactions 
D) a substance which can behave as either an acid or a base 
E) the species that results when an acid donates a proton 
A) the species that results when a base accepts a proton 
B) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
C) a theory that treats acid-base reactions as proton-transfer reactions 
D) a substance which can behave as either an acid or a base 
E) the species that results when an acid donates a proton

Question 3

What is the conjugate acid of water?

Accepted Answer

A) H2O(l) 
B) H3O+(aq) 
C) OH-(aq) 
D) H+(aq) 
E) O2-(aq) 
A) H2O(l) 
B) H3O+(aq) 
C) OH-(aq) 
D) H+(aq) 
E) O2-(aq)

Question 4

The classification of an acid or a base as weak or strong is determined by

Accepted Answer

A) the solubility of the acid or base. 
B) the extent of dissociation of the dissolved acid or base. 
C) the concentrations of the acid or base. 
D) more than one choice is correct. 
A) the solubility of the acid or base. 
B) the extent of dissociation of the dissolved acid or base. 
C) the concentrations of the acid or base. 
D) more than one choice is correct.

Question 5

C5H5N + H2CO3   C5H6N ++ HCO3-
In the reaction shown,the conjugate acid of C5H5N  is

Accepted Answer

A)  C5H5N 
B)  H2CO3  
C)  C5H6N + 
D) HCO3-. 
E)  H3O+ 
A)  C5H5N 
B)  H2CO3  
C)  C5H6N + 
D) HCO3-. 
E)  H3O+

Question 6

Which one of the following weak acids is the strongest?

Accepted Answer

A) HCN (Ka = 4.9 × 10-10) 
B) HClO (Ka = 3.0 × 10-8) 
C) HNO2 (Ka = 4.5 × 10-4) 
D) HF (Ka = 6.8 × 10-4) 
A) HCN (Ka = 4.9 × 10-10) 
B) HClO (Ka = 3.0 × 10-8) 
C) HNO2 (Ka = 4.5 × 10-4) 
D) HF (Ka = 6.8 × 10-4)

Question 7

A buffer solution

Accepted Answer

A) is a salt solution. 
B) maintains pH at 7.00. 
C) is a strong base. 
D) neutralizes only acids. 
E) closely maintains its original pH. 
A) is a salt solution. 
B) maintains pH at 7.00. 
C) is a strong base. 
D) neutralizes only acids. 
E) closely maintains its original pH.

Question 8

Which compound produces an acidic solution when dissolved in water?

Accepted Answer

A) NH4Cl 
B) NaF 
C) K2SO4 
D) KCl 
E) Ca(NO3)2 
A) NH4Cl 
B) NaF 
C) K2SO4 
D) KCl 
E) Ca(NO3)2

Question 9

What is the concentration of a phosphoric acid solution of a 25.00 mL sample of the acid requires 42.24 mL of 0.135 M NaOH for neutralization?

Accepted Answer

A) 0.228 M 
B) 0.684 M 
C) 0.0760 M 
D) 0.0266 M 
E) 0.0799 M 
A) 0.228 M 
B) 0.684 M 
C) 0.0760 M 
D) 0.0266 M 
E) 0.0799 M

Question 10

Write the balanced chemical equation for a reaction between sodium bicarbonate and hydrochloric acid.

Accepted Answer

NaHCO₃ + HC

Question 11

To prepare a buffer using sodium phosphate,which of the following would also be needed?

Accepted Answer

A) hydrochloric acid 
B) ammonium hydroxide 
C) ammonium phosphate 
D) phosphoric acid 
E) sodium hydroxide 
A) hydrochloric acid 
B) ammonium hydroxide 
C) ammonium phosphate 
D) phosphoric acid 
E) sodium hydroxide

Question 12

What is the conjugate base of water?

Accepted Answer

A) H2O(l) 
B) H3O+(aq) 
C) OH-(aq) 
D) H+(aq) 
E) O2-(aq) 
A) H2O(l) 
B) H3O+(aq) 
C) OH-(aq) 
D) H+(aq) 
E) O2-(aq)

Question 13

What is the correct Ka expression for the reaction below?
CH3COOH(aq)+ H2O(l)  CH3COO-(aq)+ H3O+(aq)

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 14

What is the correct Ka expression for the reaction below?
H2PO4-(aq)+ H2O(l)  HPO42-(aq)+ H3O+(aq)

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 15

What is the normality of a solution containing 49 g of H2SO4 in enough water to make 400 mL of solution?

Accepted Answer

A) 2.5 N 
B) 5.0 N 
C) 1.0 N 
D) 10 N 
E) 0.20 N 
A) 2.5 N 
B) 5.0 N 
C) 1.0 N 
D) 10 N 
E) 0.20 N

Question 16

What is the normality of a solution prepared by dissolving 37.5 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

Accepted Answer

A) 2.34 N 
B) 0.780 N 
C) 0.147 N 
D) 0.0865 N 
E) 0.288 N 
A) 2.34 N 
B) 0.780 N 
C) 0.147 N 
D) 0.0865 N 
E) 0.288 N

Question 17

Which of the following cannot act as a Brønsted base?

Accepted Answer

A) HCO3- 
B) CO32- 
C) NH3 
D) NH2- 
E) NH4+ 
A) HCO3- 
B) CO32- 
C) NH3 
D) NH2- 
E) NH4+

Question 18

Which of the following is a diprotic acid?

Accepted Answer

A) acetic acid 
B) hydrochloric acid 
C) phosphoric acid 
D) sulfuric acid 
E) nitric acid 
A) acetic acid 
B) hydrochloric acid 
C) phosphoric acid 
D) sulfuric acid 
E) nitric acid

Question 19

Which of the following pH's corresponds to a strongly basic solution?

Accepted Answer

A) 11.5 
B) 2.7 
C) 6.9 
D) 7.4 
E) 4.3 
A) 11.5 
B) 2.7 
C) 6.9 
D) 7.4 
E) 4.3

Question 20

What is the conjugate base of HSO4-?

Accepted Answer

A) SO42- 
B) H2SO4 
C) H3O+ 
D) OH- 
E) H2SO3 
A) SO42- 
B) H2SO4 
C) H3O+ 
D) OH- 
E) H2SO3

Exam 10: Acids and Bases

Propionic acid (CH3CH2COOH)has a Ka = 1.3 × 10-5 and phosphoric acid (H3PO4)has a Ka = 7.5 10 -3.Write the conjugate base for each.Which one is the stronger base?

Match the following. -Arrhenius theory

What is the conjugate acid of water?

The classification of an acid or a base as weak or strong is determined by

C5H5N + H2CO3 C5H6N ++ HCO3- In the reaction shown,the conjugate acid of C5H5N is

Which one of the following weak acids is the strongest?

A buffer solution

Which compound produces an acidic solution when dissolved in water?

What is the concentration of a phosphoric acid solution of a 25.00 mL sample of the acid requires 42.24 mL of 0.135 M NaOH for neutralization?

Write the balanced chemical equation for a reaction between sodium bicarbonate and hydrochloric acid.

To prepare a buffer using sodium phosphate,which of the following would also be needed?

What is the conjugate base of water?

What is the correct Ka expression for the reaction below? CH3COOH(aq)+ H2O(l) CH3COO-(aq)+ H3O+(aq)

What is the correct Ka expression for the reaction below? H2PO4-(aq)+ H2O(l) HPO42-(aq)+ H3O+(aq)

What is the normality of a solution containing 49 g of H2SO4 in enough water to make 400 mL of solution?

What is the normality of a solution prepared by dissolving 37.5 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

Which of the following cannot act as a Brønsted base?

Which of the following is a diprotic acid?

Which of the following pH's corresponds to a strongly basic solution?

What is the conjugate base of HSO4-?

Matter and Measurements

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Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

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Propionic acid (CH₃CH₂COOH)has a Ka = 1.3 × 10^-5 and phosphoric acid (H₃PO₄)has a Ka = 7.5 10 ^-3.Write the conjugate base for each.Which one is the stronger base?

C₅H₅N + H₂CO₃ C₅H₆N ⁺+ HCO₃^- In the reaction shown,the conjugate acid of C₅H₅N is

What is the correct Ka expression for the reaction below? CH₃COOH(aq)+ H₂O(l) CH₃COO^-(aq)+ H₃O⁺(aq)

What is the correct Ka expression for the reaction below? H₂PO₄^-(aq)+ H₂O(l) HPO₄^2-(aq)+ H₃O⁺(aq)

What is the normality of a solution containing 49 g of H₂SO₄ in enough water to make 400 mL of solution?

What is the conjugate base of HSO₄^-?