CW 11(1) - fi‘ 1. The Leveling Effect of Water. (An...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: fi‘ 1. The Leveling Effect of Water. (An application of Upper Left/Lower Right.) b ‘ All W3Qj exist in water as H3 0" and conjugate base. H00.l ,H-a, Hues M h: Incure mam n - AllhasgsfilMIiexist in wateras OH' and conjugate acid, _ l1. , gems w; 02- HIHIJH agorifi OH“ in waste 82” gai- in H20 mosHfl as HA5: but SW 87" mm adv PH g Reactant Problem: .A solution is formed by I mlxmg 300. mL of 0.25 M HCl and 200. mL of 0.25 M NaAc. Afiétreaction to completion, what species are present in “appreciable” (2 0.0-1 M) concentration. (a) First determine what is present After Mixing, Before Reaction. ~~' - - - l.th 501M «flushes Maine/Q [H503 $119.1 = 0-25M(§@_) : 045' M ‘ 67393 = A‘ -'- .-§ [Nod] E01 0 2 mpg): 0.10M I 04: 010 o . C. ‘-x —x +x “M” C. «3.95 0 one a -. d‘figf ToMl G) =To+a| (_-) be x=o L0 ' . basedon no“ 905”) to - 0x5 afium‘hns ‘ ' _1;_‘d0r\+_drwfi€ read-awe "S’stml W [H30+ ]— Qogm [H&g!]= 0.10m [Na+ ]= OJOM “ - -‘[ CQ‘ 1: 0.15 m (c) What is‘ the solution pH? " iOS {HaOfl : _ 003 (0.05;) Final 80W] is“ wd- ' . '3, I _ 3. Buffers. A lmffer is a W (usually a CA/CB Pair). both in “appreciable” concentration ([...] 2 0.01 M. (a) There is a W for buffers: HA. + H204; H3Q+ + A". I run. _ ' 0 [CB]. C M: *" +k ‘ E LCA10-x . 'Y '- Logo?“ ‘ _ ‘ x or. (04435851, K“ T. X X k4 ‘ _ ufloj hp % » ' . . .' “ ‘ - \ [an.-)( [as]. X * Kw (2233:) ~20.) CH30‘°J= 0.3 it... (b) Sample Problem: A solution has [HAG] = 0.25 M arid [Na"'] ='[A'c-]’= 0.10 M. - EU What is the pH of this solution? [CB] H = \(n '- Céfl P P at? 1153) 0 g .2 P‘ = “E22 076) = . — 0H0 ' . (c) In general, for any buffer, if [CA]-= [CB], then pH =’ ‘ . .' ‘ If 102 Egg} 2 0.1,thean= pr. -1. K—VJ Walkwwm Mba 3c norm 4. The Molecular Structure of Acids and Bases. (a) Oxyacids are reallylhydroxy acids. H m o. . 0““ ‘5 - ((H H2:04 is really (110)2802 Q0 . I 0(3 (H ‘ :5 Wag—lg SAW in C“. (MR; Got-w ‘ . ' I ' " tl.3\'0H mle G a? {b .- - 0 (b) Orgaaltcibgdacgifls have (—COOH) group. HAc o®iH302 is really CH3CO(@“°#;6 .ll. .- ' I t / s ' O c J’ - I (‘0 g “we. Maha- RW" I“ 3° W t H 99‘ ’CEchLkgM (c) Organic bases have an amine (—NH2) group. 5? CH3NH2 iS'a variation on NH3 H 3" \ ___ ~74 ” H 0pm Aim. W Mimi/4L woeful: 0. 0mm ((1) Amino acids are bifimctional. ‘ W W- 7‘ r H ll —- c —— "—4 H -— ... // ' . . (5' I c\ r 3N6 f C'\ 09 3'va mm H o -—- H H " -- ...
View Full Document

This note was uploaded on 02/14/2012 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

Page1 / 2

CW 11(1) - fi‘ 1. The Leveling Effect of Water. (An...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online