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6 Nov 2019

7. What is the conjugate base of H₂CO₃?

8. HClO₄ is a strong acid because it

a. produces only H⁺ and ClO₄^- ions in water.

b. produces HClO₄ , H⁺, and ClO₄^- ions in water.

c. produces H₃O⁺ ions.

d. is very concentrated.

19. Which combination of chemicals will form a buffer?

a. Solution 1: HCl and NaCl

b. Solution 2: HF and NaF

c. Solution 3: HNO₃ and HNO₂

d. Solution 4: KBr and NaBr

20. Which solutions are basic?

a. Solution 1: [H₃O⁺] = 1.6 x 10^-9

b. Solution 2: pH = 7.7

c. Solution 3: [OH^-] = 1.6 x 10^-4

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1. The concentration of H₃O⁺ ions is 4.8 x10^-9 in an aqueous solution. What is the concentration of OH^- ions and is it acidic, basic, or neutral? ANSWER IN EXPONENTIAL FORMAT. Example: 9.0e-6 for 9.0 x 10^-6 watch for sig figs please

2. Equal concentrations of all reactants and products are combined in each of the following reactions. In which direction (right or left) will the reaction proceed to achieve equilibrium?

- A.	HClO_4(aq) + CO₃^2-_(aq) â ClO₄^-_(aq) + HCO₃^-_(aq)
- B.	HCO₃^-_(aq) + SO₄^2-_(aq) â HSO₄^-_(aq) + CO₃^2-_(aq)
- C.	H₂O_(l) + NaCl_(aq) â HCl_(aq) + NaOH_(aq)
- D.	H₃PO_4(aq) + NH_3(aq) â H₂PO₄^-_(aq) + NH₄⁺_(aq)

Chapter 15 1) The name of HClO is ________. a. hydrogen chloride b. hydrochloric acid c. chloric acid d. perchloric acid e. hypochlorous acid 2) Identify the Bronsted-Lowry acid in the following reaction. H2O + CO3 2- (aq) ? HCO3 - (aq) + OH- (aq) a. H2O b. CO3 2- c. HCO3 - d. OHe. H2CO3 3) What is the [H3O+] in a solution with [OH- ] = 1.0 ï¿½ 10-12 M? a. 1.0 ï¿½ 10-12 M b. 1.0 ï¿½ 102 M c. 1.0 ï¿½ 10-7 M d. 1.0 ï¿½ 10-8 M e. 1.0 ï¿½ 10-2 M 4) What is the [OH- ] in a solution that has a [H3O+] = 1.0 ï¿½ 10-6 M? a. 1.0 ï¿½ 10-2 M b. 1.0 ï¿½ 10-6 M c. 1.0 ï¿½ 10-8 M d. 1.0 ï¿½ 10-10 M e. 1.0 ï¿½ 10-12 M 5) The [H3O+] of a solution with pH = 2.0 has a concentration of ________. a. 10 M b. 0.1 M c. 1 ï¿½ 102 M d. 1 ï¿½ 10-2 M e. 1 ï¿½ 10-12 M 6) Which of the following is the strongest acid? a. H3PO4 b. NH4 + c. NaOH d. H2CO3 e. HCl 7) Which of the following is correctly identified? a. NH3, strong acid b. NaOH, strong base c. HCl, weak acid d. H2CO3, strong acid e. Ca(OH)2, weak base 8) Ammonia is a weak base because a. it is a dilute solution. b. it is only slightly soluble in water. c. it cannot hold on to its hydroxide ions. d. it produces few hydroxide ions in water. e. it is completely ionized in aqueous solution. 9) Which of the following is a neutralization reaction? a. KCl + NaNO3 ? KNO3 + NaCl b. HNO3 + KOH ? H2O + KNO3 c. H2O + SO3 ? H2SO4 d. 4Na + O2 ? 2 Na2O e. 2 NO2 ? 2NO + O2 10) Which of the following is a buffer system? a. NaCl and NaNO3 b. HCl and NaOH c. H2CO3 and KHCO3 d. NaCl and NaOH e. H2O and HCl

11) The name given to an aqueous solution of HNO₃ is

A) nitric acid

B) nitrous acid

C) hydrogen nitrate

D) hydronitrogen acid

E) hyponitric acid

12) The conjugate acid of HSO₄^- is

A) SO₄^2-

B) HSO₄

C) H₂SO₄.

D) H₂SO₄^-

E) HSO₃^-

13) What is the [OH^-] in a solution that has a [H₃O⁺] = 1 x 10^-6 M?

A)1 x 10^-2 M

B) 1 x 10^-6 M

C)1 x 10^-8 M

D) 1 x 10^-10 M

E) 1 x 10^-12 M

14) A solution which has [OH^-] = 4.6x 10^-6 M is

A) acidic

B) basic

C) neutral

15) What is the pH of a solution with [H₃O⁺] = 1 x 10^-9 M

A) 1.0 x 10^-5M

B)-9.0

C) 5.0

D) -5.0

E) 9.0

16) Which of the following could be a buffer?

A) NaF

B) HF+NaF

C) HF+H₂O

D) NaF+H₂O

E) NaCl+HF

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