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Acids and Bases 2 - SCH~ ~"Test#6-7 Acids and Basej...

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A . B. Yl ' : \ \ SJ D. A . V @2 C . D . A . B . C . ® SC H~ ~ " " T e st #6 - 7 A c id s a nd Base j ; K N O WLE D GE AN D U N DER S T AN D I N G " - 1 . Which values are correct for a solution of NaOH of concentration 0 . 010 mol ! L at 25 ° C ? H . . L O Q 76 t ( K w = I.O x I 0- 14 at 25 ° C) t l q ( ) -7 J J tl - I ( ) rl 1 : 0 , ( ) I 0 () I C' ' J I f O . O I }( ) . (; E . ( ) (). ", f), ( 1 1 p O' " ~ . I 0i f a , Oj;) ylL ,~ -: ( ~ I ~ C 01 1: J ~ /0 ~ ' 2 . A~ 25 ° C water h~ S a pH of? Which of the following occurs when wate r is hea t ed to 3 C ? ~ . P / -1 ~ . 1 It remains neutral and its pH decreases. . t: \ J . ~ . ~ r e . . - \ I . , B . It becomes acidic and its pH decreases. ! 1 t M f e ( l f l V ~ It remains neutral and its pH increases . I r . ' It becomes acidic and its pH increases . [WJ = l . O x lO- 2 mol!L [OH - ] = 1 . 0 x lO - 2 mol!L [H l = 1 . 0 x lO - 12 mol ! L [OIr] = 1 . 0 x 10 - 12 mol ! L and and and and pH=2 . 00 pH= 12. 0 0 pOH = 1 2 .0 0 pOH= 2 . 0 0 2. Water dissociates according t o the equation H 2 0(l) ~ W(aq) + OJr(aq) HN0 3 and H 2 S0 4 HN0 3 and H 2 N0 3 + HN0 3 and HS0 4 - H 2 N 0 3 + and HS0 4 - H 2 P0 4 - (aq) + ~3(aq) ~ . HPO / - (aq) + NH 4 + (aq) H 2 P0 4 - (aq) + OJr(aq ) ~ HPO / - (aq) + H 2 0(l) H 2 P0 4 - (aq) + ~HsNH 2 (aq) ~ HPO/ - (aq) + C 2 H s NH 3 + (aq ) H 2 P0 4 - (aq) + CH 3 COOH(aq) ~ H 3 P0 4 (aq) + CH 3 COQ - (aq)
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5. Wh i ch is not a strong acid ? ~ N itric acid B . Sul : fbricacid ® Carbon i c acid D . H y dr o chloric acid 14 , . rr r - 3 1 - 1 < . S0 'f Ii C / 6. Which one of the follo wi ng species can act as both a Bmnsted-Lo w r y acid and base in aqu e ous s olution ? 7 . Lim e , Ca(OH) 2 , is added to a lake to neutralize th e ' eff e cts of acid ra in . Th e pH v alu e o f th e lak e wat e r rises from 4 to 7. What is the change in concentration of W ions in the lake wa t e r ? ' . Ii j A . An increas e by a factor of 3 . . i ~ J -: . I 0 : > t[ { . / B . An increase b y a factor of 100 0 L .. /" X A decr e as e b y a fa c tor of 3 ® A decr e as e b y a fact o r . of 1000 Wh a t is th e conc e ntration of OW ions (in mollL) in an aqueous solution i n w hich [H 1 = = 2 . 0 x I O - 3 mol l L ? (K w == l . O x lO - 1 4 ) @ 5 . 0 x l O - 12 ~ TheK a v alue fo r an a ci d i s 1 . O x I O - z .
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