comp Used You must show your work in order to receive the maximum points. to exp
ID: 507924 • Letter: C
Question
comp Used You must show your work in order to receive the maximum points. to explain your answers where it is necessary. Be neatr 1. In each reaction, identify the Bronsted-Lowry acid, the Brons Lowry base, the conjugate acid, and the conjugate base (12 pts.) Hoo (aa) HCO (aq) a. H2CO, (aa) Hzoa) b. HNO3 (aq) H2O(l) H,O (aa) NO (aa) CsHs NH (aq) OH (aa) 2. Select the stronger base from each pair. Why? (6 pts.) a. For Cl b. NO2 or NO,- c. For CIO 3. Determine the [OHj and pH of a 0.0212 M Al(OH 3 solution (4 pts) 4. What mass of HI must be present in o.250 L to obtain a solution with a pH "2.85? (5 pts.) 5. If 15.0 mL of glacial acetic acid (pure cH cooH) is diluted to 1.50 L with water, what is the pH of the resulting solution? The density of glacial acetic acid is 1.05 g/mL. (5 pts) 6. (a) Given that K for ammonia is 1.8 x 10s and that for hydroxylamine is 1.1 x 10 which is the stronger base? Why? (2 pts.) (b) Which is the stronger acid, the ammonium ion or the hydroxylammonium ion? Why? (2 pts.) (c) Calculate the Ka values for NH (ammonium ion) and H,NOH (hydroxylammonium ion). (4 pts)Explanation / Answer
(1)
Proton donor is a Bronsted - Lowry acid and Proton acceptor is a Bronsted - Lowry base.
(a) H2CO3 (aq.) + H2O (l) = H3O+ (aq.) + HCO3- (aq.)
Acid : H2CO3
Base : H2O
Conjugate acid: H3O+
Conjugate base: HCO3-
(b) HNO3 (aq.) + H2O (l) = H3O+ (aq.) + NO3- (aq.)
Acid : HNO3
Base: H2O
Conjugate acid: H3O+
Conjugate base: NO3-
(c) C5H5N (aq.) + H2O (l) = C5H5NH+ (aq.) + OH- (aq.)
Acid : H2O
Base: C5H5N
Conjugate acid: C5H5NH+
Conjugate base: OH-
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