Question 1

Write the chemical formula for the acid formed when Cl2O5 is dissolved in water.

Accepted Answer

Question 2

Which one of these statements about strong acids is true?

Accepted Answer

A) All strong acids have H atoms bonded to electronegative oxygen atoms. 
B) Strong acids are 100% ionized in water. 
C) The conjugate base of a strong acid is itself a strong base. 
D) Strong acids are very concentrated acids. 
E) Strong acids produce solutions with a higher pH than weak acids. 
A) All strong acids have H atoms bonded to electronegative oxygen atoms. 
B) Strong acids are 100% ionized in water. 
C) The conjugate base of a strong acid is itself a strong base. 
D) Strong acids are very concentrated acids. 
E) Strong acids produce solutions with a higher pH than weak acids.

Question 3

Arrange the acids HOCl, HClO3, and HClO2 in order of increasing acid strength.

Accepted Answer

A) HOCl 3 2 
B) HOCl 2 3 
C) HClO2 3 
D) HClO3 2 
E) HClO3 2 < HOCl 
A) HOCl 3 2 
B) HOCl 2 3 
C) HClO2 3 
D) HClO3 2 
E) HClO3 2 < HOCl

Question 4

Which is not a characteristic property of acids?

Accepted Answer

A) neutralizes bases 
B) turns litmus from blue to red 
C) reacts with active metals to produce H2(g) 
D) reacts with CO2(g)to form carbonates 
E) All of the above are characteristic properties of acids. 
A) neutralizes bases 
B) turns litmus from blue to red 
C) reacts with active metals to produce H2(g) 
D) reacts with CO2(g)to form carbonates 
E) All of the above are characteristic properties of acids.

Question 5

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0. How many times greater is the H3O+ concentration in diet cola than in milk?

Accepted Answer

A) 2.3 times higher in diet cola than in milk 
B) 400 times higher in diet cola than in milk 
C) 0.43 times higher in diet cola than in milk 
D) 1,000 times higher in diet cola than in milk 
E) 10,000 times higher in diet cola than in milk 
A) 2.3 times higher in diet cola than in milk 
B) 400 times higher in diet cola than in milk 
C) 0.43 times higher in diet cola than in milk 
D) 1,000 times higher in diet cola than in milk 
E) 10,000 times higher in diet cola than in milk

Question 6

A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.

Accepted Answer

A) 0.84 M 
B) 0.12 M 
C) 0.10 M 
D) 0.084 M 
E) 8.4 * 10-3 M 
A) 0.84 M 
B) 0.12 M 
C) 0.10 M 
D) 0.084 M 
E) 8.4 * 10-3 M

Question 7

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO3? [Ka(HIO3)= 1.6 * 10-1]

Accepted Answer

A) 1.52 
B) 0.80 
C) 0.72 
D) 0.89 
E) 0.66 
A) 1.52 
B) 0.80 
C) 0.72 
D) 0.89 
E) 0.66

Question 8

Calculate the H+ ion concentration in a 8.8 * 10-4 M Ca(OH)2 solution.

Accepted Answer

A) 8.8 * 10-4 M 
B) 1.8 * 10-3 M 
C) 2.2 * 10-11 M 
D) 1.1 * 10-11 M 
E) 5.7 * 10-12 M 
A) 8.8 * 10-4 M 
B) 1.8 * 10-3 M 
C) 2.2 * 10-11 M 
D) 1.1 * 10-11 M 
E) 5.7 * 10-12 M

Question 9

Will a 0.1 M solution of NH4CN(aq)be acidic, basic, or neutral?

Accepted Answer

Question 10

Acid strength decreases in the series: strongest HSO4- > HF > HCN. Which of these species is the weakest base?

Accepted Answer

A) HF 
B) SO42- 
C) F- 
D) CN- 
A) HF 
B) SO42- 
C) F- 
D) CN-

Question 11

Which one of these salts will form a basic solution on dissolving in water?

Accepted Answer

A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3 
A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3

Question 12

What mass of sodium formate (HCOONa)must be added to 350.mL of water in order to obtain a solution having a pH of 8.50? [Ka(HCOOH)= 1.77 * 10-4]

Accepted Answer

A) 0.23 g 
B) 4.3 g 
C) 35 g 
D) 12 g 
E) 130 g 
A) 0.23 g 
B) 4.3 g 
C) 35 g 
D) 12 g 
E) 130 g

Question 13

The oxides SO2 and N2O5 will form the following acids in water, respectively.

Accepted Answer

A) H2SO4(aq)and HNO3(aq) 
B) H2SO3(aq)and HNO3(aq) 
C) H2SO4(aq)and HNO2(aq) 
D) H2SO3(aq)and HNO2(aq) 
E) H2S(aq)and HNO3(aq) 
A) H2SO4(aq)and HNO3(aq) 
B) H2SO3(aq)and HNO3(aq) 
C) H2SO4(aq)and HNO2(aq) 
D) H2SO3(aq)and HNO2(aq) 
E) H2S(aq)and HNO3(aq)

Question 14

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 * 105 m3 of water. If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Accepted Answer

A) 5.44 
B) 8.56 
C) 8.44 
D) 5.56 
E) 2.44 
A) 5.44 
B) 8.56 
C) 8.44 
D) 5.56 
E) 2.44

Question 15

Predict the direction in which the equilibrium will lie for the reaction H2CO3 + F- 
    HCO3- + HF. Ka1( H2CO3)= 4.2 * 10-7; Ka(HF)= 7.1 * 10-4

Accepted Answer

A) to the right 
B) to the left 
C) in the middle 
A) to the right 
B) to the left 
C) in the middle

Question 16

Calculate the pH of a 1.6 M KOH solution.

Accepted Answer

A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80 
A) 1.60 
B) -0.20 
C) 0.20 
D) 14.20 
E) 13.80

Question 17

Morphine, C17H19NO3, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100.mL of water? (For morphine, Kb = 1.62 * 10-6.)

Accepted Answer

A) 9.57 
B) 9.08 
C) 3.79 
D) 9.87 
E) 4.43 
A) 9.57 
B) 9.08 
C) 3.79 
D) 9.87 
E) 4.43

Question 18

What mass of sodium cyanide must be added to 250.mL of water in order to obtain a solution having a pH of 10.50? [Ka(HCN)= 4.9 * 10-10]

Accepted Answer

A) 240 g 
B) 0.032 g 
C) 0.059 g 
D) 0.94 g 
E) 0.24 g 
A) 240 g 
B) 0.032 g 
C) 0.059 g 
D) 0.94 g 
E) 0.24 g

Question 19

Calculate the pH of a 0.021 M NaCN solution. [Ka(HCN)= 4.9 *10-10]

Accepted Answer

A) 1.68 
B) 3.18 
C) 5.49 
D) 7.00 
E) 10.82 
A) 1.68 
B) 3.18 
C) 5.49 
D) 7.00 
E) 10.82

Question 20

In the reaction HSO4-(aq)+ OH-(aq)   SO42-(aq)+ H2O(l), the conjugate acid-base pairs are

Accepted Answer

Exam 15: Acids and Bases

Write the chemical formula for the acid formed when Cl2O5 is dissolved in water.

Which one of these statements about strong acids is true?

Arrange the acids HOCl, HClO3, and HClO2 in order of increasing acid strength.

Which is not a characteristic property of acids?

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0. How many times greater is the H3O+ concentration in diet cola than in milk?

A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO3? [Ka(HIO3)= 1.6 * 10-1]

Calculate the H+ ion concentration in a 8.8 * 10-4 M Ca(OH)2 solution.

Will a 0.1 M solution of NH4CN(aq)be acidic, basic, or neutral?

Acid strength decreases in the series: strongest HSO4- > HF > HCN. Which of these species is the weakest base?

Which one of these salts will form a basic solution on dissolving in water?

What mass of sodium formate (HCOONa)must be added to 350.mL of water in order to obtain a solution having a pH of 8.50? [Ka(HCOOH)= 1.77 * 10-4]

The oxides SO2 and N2O5 will form the following acids in water, respectively.

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 * 105 m3 of water. If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Predict the direction in which the equilibrium will lie for the reaction H2CO3 + F- HCO3- + HF. Ka1( H2CO3)= 4.2 * 10-7; Ka(HF)= 7.1 * 10-4

Calculate the pH of a 1.6 M KOH solution.

Morphine, C17H19NO3, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100.mL of water? (For morphine, Kb = 1.62 * 10-6.)

What mass of sodium cyanide must be added to 250.mL of water in order to obtain a solution having a pH of 10.50? [Ka(HCN)= 4.9 * 10-10]

Calculate the pH of a 0.021 M NaCN solution. [Ka(HCN)= 4.9 *10-10]

In the reaction HSO4-(aq)+ OH-(aq) SO42-(aq)+ H2O(l), the conjugate acid-base pairs are

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Write the chemical formula for the acid formed when Cl₂O₅ is dissolved in water.

Arrange the acids HOCl, HClO₃, and HClO₂ in order of increasing acid strength.

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0. How many times greater is the H₃O⁺ concentration in diet cola than in milk?

A 0.10 M HF solution is 8.4% ionized. Calculate the H⁺ ion concentration.

What is the pH of a solution prepared by mixing 50.0 mL of 0.300 M HCl with 450.0 mL of 0.400 M HIO₃? [K_a(HIO₃)= 1.6 * 10^-1]

Calculate the H⁺ ion concentration in a 8.8 * 10^-4 M Ca(OH)₂ solution.

Will a 0.1 M solution of NH₄CN(aq)be acidic, basic, or neutral?

Acid strength decreases in the series: strongest HSO₄^- > HF > HCN. Which of these species is the weakest base?

What mass of sodium formate (HCOONa)must be added to 350.mL of water in order to obtain a solution having a pH of 8.50? [K_a(HCOOH)= 1.77 * 10^-4]

The oxides SO₂ and N₂O₅ will form the following acids in water, respectively.

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 * 10⁵ m³ of water. If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Predict the direction in which the equilibrium will lie for the reaction H₂CO₃ + F^- HCO₃^- + HF. K_a1(H₂CO₃)= 4.2 * 10^-7; K_a(HF)= 7.1 * 10^-4

Morphine, C₁₇H₁₉NO₃, is often used to control severe post-operative pain. What is the pH of the solution made by dissolving 25.0 mg of morphine in 100.mL of water? (For morphine, K_b = 1.62 * 10^-6.)

What mass of sodium cyanide must be added to 250.mL of water in order to obtain a solution having a pH of 10.50? [K_a(HCN)= 4.9 * 10^-10]

Calculate the pH of a 0.021 M NaCN solution. [K_a(HCN)= 4.9 *10^-10]

In the reaction HSO₄^-(aq)+ OH^-(aq) SO₄^2-(aq)+ H₂O(l), the conjugate acid-base pairs are