Given the balanced equation representing a reaction: HSO_4^-(aq) + H_2O(l) right

Question

Given the balanced equation representing a reaction: HSO_4^-(aq) + H_2O(l) rightarrow H_3 O^+ (aq) + SO_4^2-(aq) According to one acid-base theory, the H_2O(l) molecules act as A) a base bccausc they accept H^+ ions B) a base because they donate H^+ ions C) an acid because they accept H^+ ions D) an acid because they donate H^+ ions In the reaction: NH_3 + HCl rightarrow NH_4^+ + Cl^- The NH_3 acts as A) a Bronsted acid, only B) a Bronsted base, only C) both a Bronsted acid and a Bronsted base D) neither a Bronsted acid nor a Bronsted base In the reaction: HSO_4^- (aq) + H_2O(l) leftrightarrow H_3O^+ (aq) + SO_4^2- (aq) Which species are acting as acids by donating protons? A) HSO_4^- (aq) and H_3O^+ (aq) B) HSO_4^- (aq) and H_2O(l) C) H_3O^+ (aq) and SO_4^2- (aq) D) H_2O^+ (aq) and H_2O(l) Given the reaction: HSO_4^- + HPO_4^2- leftarrow SO_4^2- + H_2PO_4 Which pair represents an acid and its conjugate base? A) HSO_4^- and SO_4^2- B) HSO_4^- and HPO_4^2- C) SO_4^2- and H_2PO_4^- D) SO_4^2- and HPO_4^2- Given the reaction at equilibrium: C_2H_3O_2^- (aq) + H_2S(aq) leftrightarrow HS (aq) + HC_2H_3O_2 (aq) Which pair represents the Bronstcd-Lowry bases in this reaction? A) C_2H_3O_2^- (aq) and H_2S(aq) B) C_2H_3O_2^- (aq) and HS^- (aq) C) H_2S(aq)andHC_2H_3O_2(aq) D) HS^-(aq) and HC_2H_3O_2(aq) Which statement correctly describes a solution with a pH of9? A) It has a higher concentration of H_3O^+ than OH^- and causes litmus to turn blue. B) It has a higher concentration of OH^- than H_3O^+ and causes litmus to turn blue. C) It has a higher concentration of H_3O^+ than OH and causes methyl orange to turn yellow. D) It has a higher concentration of OH^- than H_3O^+ and causes methyl orange to turn red. A radioactive isotope used in the study of many organic reaction mechanisms is A) carbon-12 B) carbon-14 C) oxygen-16 D) oxygen-18 Which radioisotope is used to treat thyroid disorders? A) Co-60 B) 1-131 C) C-14 D) U-238 A radioisotope which is sometimes used by doctors to pinpoint a brain tumor is A) carbon-12 B) lead-206 C) tcchnctium-99 D) uranium-238

Explanation / Answer

66. The given reaction is

HSO4- (aq) + H2O (l) ------> H3O+ (aq) + SO42- (aq)

H2O (l) picks up a proton (H+) from HSO4- (aq) and forms H3O+; therefore, H2O (l) is a Bronsted base.

Ans: (A)

67. The given reaction is

NH3 (aq) + HCl (aq) -------> NH4+ (aq) + Cl- (aq)

NH3 picks up a proton from HCl and forms NH4+. As per Bronsted definition of a base (proton acceptor), NH3 is a Bronsted base only.

Ans: (B)

68. The reaction is the same as in (66). HSO4- donates a proton to H2O and forms SO42-. On the other hand, H3O+ can donate a proton to SO42- to form HSO4- (reverse reaction). As per Bronsted, an acid is defined as a proton donor. Therefore, HSO4- and H3O+ are Bronsted acids.

Ans: (A)

69. The given reaction is

HSO4- (aq) + HPO42- (aq) <-------> SO42- (aq) + H2PO4- (aq)

HSO4- donates a proton to HPO42- and forms SO42-. Therefore, HSO4- is a Bronsted acid. The conjugate base is formed from a Bronsted acid by losing a proton. Since HSO4- forms SO42- by losing a proton, hence SO42- is the conjugate base of HSO4-.

Ans: (A)

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