Test 3 with Resolution | General Chemistry II | CHE 1113, Exams of Chemistry

Download Test 3 with Resolution | General Chemistry II | CHE 1113 and more Exams Chemistry in PDF only on Docsity! CHE 1303 TEST I DR. POWELL APRIL 4, 2008 Please print your name on both the test paper and the Scan Tron form. SECTION1. MULTIPLE CHOICE (7 points each). A. Which of the following buffer solutions should have the highest pH? (a) 0.075 M KBrO,/ 0.025 M HBrO, ay ka 2 Aolt b) 0.075 M KBrO,/ 0.050 M HBrO, = |.S c) 0.040 M KBrO,/ 0.025 M HBr, =|, d) 0.050 M KBrO,/ 0.025 M HBrO, = 2 e) 0.025 M KBrO,/ 0.040 M HBrO, =.() 95" Wy ( Which of the following 0.100 M solutions has the highest pH? HA, Ka = 2x 10° A ee Oh Kets 10° Ph c) HCI d) HA, Ka =3.2 x 10% CEDNHs, Ky=1.8x 10% Joie he, se ¥ | Three weak acids and their K, values are: y Skeo / Acetic acid, Ka = 1.8 x 10°; _ wea” adn * “| ‘—“__ Hypochlorous acid, Ka = 1.1 x 10°: Hypobromous acid, Ka = 2.1 x 10° Which of the following is the strongest base? a) CH3COO" b) OCI er C@) HoBr e) HOCI 4. | What is the conjugate base of OH a) H,0 b) HOH c) OH)” d) H;0* = oO 2 6 4 SECTION 2. PROBLEMS (10 points oth, es i a Cs) A 0.200 M solution of a erase te acid is 11.00% ionized. What is the K, for this acid 6 S S BOY. 032 25 a) 0.200 ta G ay 2.72 x 10-3 t . OA C)AD4 10a Neat ea d) 4.84x 10-4. §..2--\\ 2? 2 Cp 95 > e) 1.21x 102 Ta. aaa ie ial ; .o-,092 6. ] The K, for pyridine, CsHsN i is 1.50 x 10-9. What is fre Rupe of a 0. ae M solution of pyridine? : , a - ] ” 5 Ne ol” - y> 275 Yas Axio a _b.ox! aia ka-bb bw=l.0x74 b) 9.95 OF .50X(p Jixio'4 Bees X72 5.0035 XI" 405 ve 7.07 wir 4 -\0gy"7.0% 4 - BAC