Question 1

Which of the following is both a Lewis Base and a Brønsted Acid A)H₂PO₄^- B)PO₄^3- C)NH₄⁺ D)F^- E)BF₃

Accepted Answer

Water (H2O) can act as a Lewis base by donating a pair of electrons and as a Brønsted acid by donating a proton.

Question 2

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

Accepted Answer

The answer of Predict the direction in which the equilibrium...

Question 3

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13.An aqueous solution of NaH₂PO₄ therefore would be A)neutral B)basic C)acidic

Accepted Answer

NaH₂PO₄ is the salt of a weak acid (H₃PO₄) and a strong base (NaOH). It will hydrolyze in water to produce H₂PO₄⁻, which can donate a proton, making the solution acidic.

Question 4

In the reaction CaO(s)+ SO₂(g) CaSO₃(s), A)O^2- acts as a Lewis base, and SO₂ acts as a Lewis acid. B)Ca²⁺ acts as a Lewis base, and SO₄^2- acts as a Lewis acid. C)SO₄^2- acts as a Lewis base, and SO₂ acts as a Lewis acid. D)SO₂ acts as a Lewis base, and O^2- acts as a Lewis acid. E)SO₂ acts as a Lewis base, and Ca²⁺ acts as a Lewis acid.

Accepted Answer

The answer of In the reaction CaO(s)+ SO₂(g) _...

Question 5

The oxides CO₂ and SO₃ will form the following acids in water, respectively. A)H₂CO₃(aq)and H₂SO₃(aq) B)H₂CO₃(aq)and H₂SO₄(aq) C)H₂CO₂(aq)and H₂SO₃(aq) D)H₂CO₂(aq)and H₂SO₄(aq) E)HCOO^-(aq)and H₂SO₃(aq)

Accepted Answer

The answer of The oxides CO₂ and SO₃ will form...

Question 6

Calculate the concentration of chromate ion (CrO₄^2-)in a 0.450 M solution of chromic acid (H₂CrO₄).[For chromic acid, K_a1 = 0.18, K_a2 = 3.2 × 10^-7.] A)3.2 × 10^-7 M B)1.5 × 10^-6 M C)0.081 M D)1.1 × 10^-6 M E)0.21 M

Accepted Answer

The answer of Calculate the concentration of chromate ion (CrO₄^2-)in...

Question 7

Which of the following is both a Lewis Acid and Brønsted Acid? A)BF₃ B)NH₃ C)CO₂ D)HNO₂ E)PCl₃

Accepted Answer

HNOS is both a Lewis Acid and Brønsted Acid. It can accept an electron pair (making it a Lewis acid) and donate a proton (making it a Brønsted acid).

Question 8

Calculate the concentration of oxalate ion (C₂O₄^2-)in a 0.175 M solution of oxalic acid (C₂H₂O₄).[For oxalic acid, K_a1 = 6.5 × 10^-2, K_a2 = 6.1 × 10^-5.] A)0.11 M B)6.1 × 10^-5 M C)4.0 × 10^-6 M D)0.0791 M E)0.175 M

Accepted Answer

The answer of Calculate the concentration of oxalate ion (C₂O₄^2-)in...

Question 9

Which of the following yields a basic solution when dissolved in water? I.NH₃ II.Na₂O III.LiOH IV.P₄O₁₀ A)I and II B)I and IV C)II and III D)I, II, and III E)I, II, III, and IV

Accepted Answer

NH₃ (ammonia) acts as a weak base in water. Na₂O (sodium oxide) reacts with water to form NaOH, a strong base. LiOH (lithium hydroxide) is a strong base. P₄O₁₀ forms phosphoric acid in water, which is acidic, not basic.

Question 10

Hard water deposits (calcium carbonate)have built up around your bathroom sink.Which one of these substances would be most effective in dissolving the deposits?
A)ammonia
B)bleach (sodium hypochlorite)
C)lye (sodium hydroxide)
D)vinegar (acetic acid)

Accepted Answer

Vinegar (acetic acid) is the best choice to dissolve calcium carbonate deposits. This is because vinegar is a weak acid that reacts with the calcium carbonate to form calcium ions, carbon dioxide, and water, ultimately dissolving the mineral buildup. The other substances listed (ammonia, bleach, and lye) are not effective in dissolving calcium carbonate deposits.

Question 11

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄(aq)+ HSO₄^-(aq) H₂PO₄^-(aq)+ H₂SO₄(aq). K_a1(H₃PO₄)= 7.5 × 10^-3; K_a(H₂SO₄)= very large A)to the right B)to the left C)in the middle

Accepted Answer

The answer of Predict the direction in which the equilibrium...

Question 12

Calculate the concentration of malonate ion (C₃H₂O₄^2-)in a 0.200 M solution of malonic acid (C₃H₄O₄).[For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.] A)2.8 × 10^-4 M B)0.016 M C)1.8 × 10^-4 M D)1.4 × 10^-3 M E)2.0 × 10^-6 M

Accepted Answer

The answer of Calculate the concentration of malonate ion (C₃H₂O₄^2-)in...

Question 13

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄ + NO₃^- H₂PO₄^- + HNO₃ K_a(H₃PO₄)= 7.5 × 10^-3 A)to the right B)to the left C)in the middle

Accepted Answer

The answer of Predict the direction in which the equilibrium...

Question 14

Hydrosulfuric acid is a diprotic acid, for which K_a1 = 5.7 × 10^-8 andK_a2 = 1 × 10^-19.Determine the concentration of sulfide ion in a 0.10 M hydrosulfuric solution. A)0.10 M B)7.5 × 10^-5 M C)5.7 × 10^-9 M D)1 × 10^-19 M E)1 × 10^-20 M

Accepted Answer

The answer of Hydrosulfuric acid is a diprotic acid, for...

Question 15

Which of the following yields an acidic solution when dissolved in water? I.NO₂ II.NH₄Cl III.NaCl IV.HNO₂ A)I and IV B)II and III C)I, II, and IV D)I and III E)I, II, III, and IV

Accepted Answer

NO2 forms HNO3 and HNO2 in water, NH4Cl forms NH4+ which releases H+ ions, and HNO2 is a weak acid. NaCl does not affect pH.

Question 16

Predict the direction in which the equilibrium will lie for the reaction C₆H₅COO^- + HF C₆H₅COOH + F^-. K_a(C₆H₅COOH)= 6.5 × 10^-5; K_a(HF)= 7.1 × 10^-4 A)to the right B)to the left C)in the middle

Accepted Answer

The equilibrium constant for the forward reaction is greater than the equilibrium constant for the reverse reaction. Therefore, the equilibrium will lie to the right, favoring the formation of products.

Question 17

Which of these species will act as a Lewis acid? A)NH₃ B)NH₄⁺ C)H₂O D)BF₃ E)F^-

Accepted Answer

The BF in BF3 represents boron trifluoride, which is a common Lewis acid. Therefore, the species BF₃ can act as a Lewis acid.

Question 18

The equilibrium expression for the hydrolysis of a weak base, A^-, in water is: A)K_b = [A^-]/[OH^-][H₃O⁺] B)K_b = [OH^-][H₃O⁺]/[A^-] C)K_b = [OH^-][HA]/[A^-] D)K_b = [OH^-][A^-]/[HA] E)K_b = [OH^-][HA]/[A^-][H₃O⁺]

Accepted Answer

The answer of The equilibrium expression for the hydrolysis of...

Question 19

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

Accepted Answer

The oxides SO2 and NO2 in water form H2SO3 (sulfurous acid) and HNO3 (nitric acid), respectively.

Question 20

Predict the direction in which the equilibrium will lie for the reaction H₂SO₃(aq)+ HCO₃^-(aq) HSO₃^-(aq)+ H₂CO₃(aq). K_a1(H₂SO₃)= 1 × 10^-2; K_a1(H₂CO₃)= 4.2 × 10^-7 A)to the right B)to the left C)in the middle

Accepted Answer

The equilibrium constant for the forward reaction (HSO₃^-(aq)+ H₂CO₃(aq)) is much larger than that of the reverse reaction (H₂SO₃(aq)+ HCO₃^-(aq)). Thus, the equilibrium will shift to the right to reach equilibrium.

Quiz 15: Acids and Bases

Which of the following is both a Lewis Base and a Brønsted Acid

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

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13.An aqueous solution of NaH₂PO₄ therefore would be

In the reaction CaO(s) + SO₂(g) CaSO₃(s) ,

The oxides CO₂ and SO₃ will form the following acids in water, respectively.

Calculate the concentration of chromate ion (CrO₄^2-) in a 0.450 M solution of chromic acid (H₂CrO₄) .[For chromic acid, K_a1 = 0.18, K_a2 = 3.2 × 10^-7.]

Which of the following is both a Lewis Acid and Brønsted Acid?

Calculate the concentration of oxalate ion (C₂O₄^2-) in a 0.175 M solution of oxalic acid (C₂H₂O₄) .[For oxalic acid, K_a1 = 6.5 × 10^-2, K_a2 = 6.1 × 10^-5.]

Which of the following yields a basic solution when dissolved in water? I.NH₃ II.Na₂O III.LiOH IV.P₄O₁₀

Hard water deposits (calcium carbonate) have built up around your bathroom sink.Which one of these substances would be most effective in dissolving the deposits?

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄(aq) + HSO₄^-(aq) H₂PO₄^-(aq) + H₂SO₄(aq) . K_a1(H₃PO₄) = 7.5 × 10^-3; K_a(H₂SO₄) = very large

Calculate the concentration of malonate ion (C₃H₂O₄^2-) in a 0.200 M solution of malonic acid (C₃H₄O₄) .[For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.]

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄ + NO₃^- H₂PO₄^- + HNO₃ K_a(H₃PO₄) = 7.5 × 10^-3

Hydrosulfuric acid is a diprotic acid, for which K_a1 = 5.7 × 10^-8 andK_a2 = 1 × 10^-19.Determine the concentration of sulfide ion in a 0.10 M hydrosulfuric solution.

Which of the following yields an acidic solution when dissolved in water? I.NO₂ II.NH₄Cl III.NaCl IV.HNO₂

Predict the direction in which the equilibrium will lie for the reaction C₆H₅COO^- + HF C₆H₅COOH + F^-. K_a(C₆H₅COOH) = 6.5 × 10^-5; K_a(HF) = 7.1 × 10^-4

Which of these species will act as a Lewis acid?

The equilibrium expression for the hydrolysis of a weak base, A^-, in water is:

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

Predict the direction in which the equilibrium will lie for the reaction H₂SO₃(aq) + HCO₃^-(aq) HSO₃^-(aq) + H₂CO₃(aq) . K_a1(H₂SO₃) = 1 × 10^-2; K_a1(H₂CO₃) = 4.2 × 10^-7

Quiz 15: Acids and Bases

Which of the following is both a Lewis Base and a Brønsted Acid

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

For H3PO4, Ka1 = 7.3 × 10-3, Ka2 = 6.2 × 10-6, and Ka3 = 4.8 × 10-13.An aqueous solution of NaH2PO4 therefore would be

In the reaction CaO(s) + SO2(g) CaSO3(s) ,

The oxides CO2 and SO3 will form the following acids in water, respectively.

Calculate the concentration of chromate ion (CrO42-) in a 0.450 M solution of chromic acid (H2CrO4) .[For chromic acid, Ka1 = 0.18, Ka2 = 3.2 × 10-7.]

Which of the following is both a Lewis Acid and Brønsted Acid?

Calculate the concentration of oxalate ion (C2O42-) in a 0.175 M solution of oxalic acid (C2H2O4) .[For oxalic acid, Ka1 = 6.5 × 10-2, Ka2 = 6.1 × 10-5.]

Which of the following yields a basic solution when dissolved in water? I.NH3 II.Na2O III.LiOH IV.P4O10

Hard water deposits (calcium carbonate) have built up around your bathroom sink.Which one of these substances would be most effective in dissolving the deposits?

Predict the direction in which the equilibrium will lie for the reaction H3PO4(aq) + HSO4-(aq) H2PO4-(aq) + H2SO4(aq) . Ka1(H3PO4) = 7.5 × 10-3; Ka(H2SO4) = very large

Calculate the concentration of malonate ion (C3H2O42-) in a 0.200 M solution of malonic acid (C3H4O4) .[For malonic acid, Ka1 = 1.4 × 10-3, Ka2 = 2.0 × 10-6.]

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- H2PO4- + HNO3 Ka(H3PO4) = 7.5 × 10-3

Hydrosulfuric acid is a diprotic acid, for which Ka1 = 5.7 × 10-8 and Ka2 = 1 × 10-19.Determine the concentration of sulfide ion in a 0.10 M hydrosulfuric solution.

Which of the following yields an acidic solution when dissolved in water? I.NO2 II.NH4Cl III.NaCl IV.HNO2

Predict the direction in which the equilibrium will lie for the reaction C6H5COO- + HF C6H5COOH + F- . Ka(C6H5COOH) = 6.5 × 10-5; Ka(HF) = 7.1 × 10-4

Which of these species will act as a Lewis acid?

The equilibrium expression for the hydrolysis of a weak base, A-, in water is:

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

Predict the direction in which the equilibrium will lie for the reaction H2SO3(aq) + HCO3- (aq) HSO3-(aq) + H2CO3(aq) . Ka1(H2SO3) = 1 × 10-2; Ka1(H2CO3) = 4.2 × 10-7

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

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13.An aqueous solution of NaH₂PO₄ therefore would be

In the reaction CaO(s) + SO₂(g) CaSO₃(s) ,

The oxides CO₂ and SO₃ will form the following acids in water, respectively.

Calculate the concentration of chromate ion (CrO₄^2-) in a 0.450 M solution of chromic acid (H₂CrO₄) .[For chromic acid, K_a1 = 0.18, K_a2 = 3.2 × 10^-7.]

Calculate the concentration of oxalate ion (C₂O₄^2-) in a 0.175 M solution of oxalic acid (C₂H₂O₄) .[For oxalic acid, K_a1 = 6.5 × 10^-2, K_a2 = 6.1 × 10^-5.]

Which of the following yields a basic solution when dissolved in water? I.NH₃ II.Na₂O III.LiOH IV.P₄O₁₀

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄(aq) + HSO₄^-(aq) H₂PO₄^-(aq) + H₂SO₄(aq) . K_a1(H₃PO₄) = 7.5 × 10^-3; K_a(H₂SO₄) = very large

Calculate the concentration of malonate ion (C₃H₂O₄^2-) in a 0.200 M solution of malonic acid (C₃H₄O₄) .[For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.]

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄ + NO₃^- H₂PO₄^- + HNO₃ K_a(H₃PO₄) = 7.5 × 10^-3

Hydrosulfuric acid is a diprotic acid, for which K_a1 = 5.7 × 10^-8 andK_a2 = 1 × 10^-19.Determine the concentration of sulfide ion in a 0.10 M hydrosulfuric solution.

Which of the following yields an acidic solution when dissolved in water? I.NO₂ II.NH₄Cl III.NaCl IV.HNO₂

Predict the direction in which the equilibrium will lie for the reaction C₆H₅COO^- + HF C₆H₅COOH + F^-. K_a(C₆H₅COOH) = 6.5 × 10^-5; K_a(HF) = 7.1 × 10^-4

The equilibrium expression for the hydrolysis of a weak base, A^-, in water is:

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

Predict the direction in which the equilibrium will lie for the reaction H₂SO₃(aq) + HCO₃^-(aq) HSO₃^-(aq) + H₂CO₃(aq) . K_a1(H₂SO₃) = 1 × 10^-2; K_a1(H₂CO₃) = 4.2 × 10^-7