CW 15 - Class Worksheet 15 1. Acid-Base Indicators - Highly...

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Unformatted text preview: Class Worksheet 15 1. Acid-Base Indicators - Highly colored, very low concentration weak acids: th+H20_<_-, H30++In- Malia (Mint in,” be, fines/M : ' Thepfiaof an indicator is its WILLIE. A 7 i¥ :lo+oh >i2golnmm0‘ I - F "'5' 1 ‘4‘» — ma eH>-PKQ_,va:l;s _lo 4&0 m ah ' 3'“ ) :— 1 , 0 See the separate table for a list of common pHI 1. and their pKaas- 0 Use 2 or more indicators to find the pH of a solution.‘ radar” r H— enry waigrgTB-e’fi MPH>4 - 3?”:34— Diwnaz «914 5’6 (Vs/w) gxgwgiwafi'uf PH 6— WIZL - In a titration pick an indicator that changes at the pH of the equivalence point: For H30+' + 0H“ -—+ 2H20, pH(atEP)= :L souse E‘TE PMW Vr‘aiéu/ia—L tau Wicca, PL-fA K; PM“ For HAc + OH' —> Ac” + H20,pH(atEP)= g‘q,50'me Ph‘i’L C712 wotJd Hall For NH4+ + OH' —> NH3 + H20,pH(atEP)= ,souse \1 . 2. Solubility Equilibria. The “standard form” way to write a solubility chemical equation is in the form “solid # ions” and the equilibrium constant is called a “solubility product,” is)» ,. 1'9— e‘fi/v‘ “0 13'“ “v _r - . ‘t L 2_ “T P lo _L7_ 25" V ‘0 ‘t‘ r“ 3. Solubility Problems. A. Solubility in Water. (1) What are [Ag+] and [Cl‘] for AgCl saturated in water? AgCKS) 4—9—— Aa+(aq) + Cl'(aq), Ksp1.8x10-10 . le9x|0"'o .3- MW? 6 ’5‘ _ (y‘— WM'7; [Ag+]= 13m? MW [01-]: -1..3z,0-5’M. (2) What are [Ag+] and [Cr04'2] for AggCrO4 saturated in water? AggCrO4 (s) 4_:_ 2 Ag+ (aq) + Cr04-2 (aq), Ksp 1.1 x 10-12 7.— 1" 2: o v a..— W MJ (2; La- C. 4- 2:34. ’34-— ; 7‘9" f; 1: Ln“- ‘11 [Agfi = MM [c.04-21=m "' B. Common Ion Effect. 4, , 3 H30)“ g. (3)What are [Ag] and [Cl'] for AgCl saturatedin0.10MHCl? 95% m“ :: 3a. AgCle) 4; Ag+(aq) + CI-(aq), Ksp 1.8x 10-10 M I f l NJ: _ :r: 0 0 '0 M , 7 “at? C «tin 1.x ['3’Xl0 :1( +040. ' ._ ‘ Hm 1- E W aft—roan) I v «m I m: \‘Wm [Ag+1= ‘% 0 q M [Cl-1 =_@_:I_w__ C. Wprking Backwards (4) Saturatad Ca(OH)2 is 0.025 M. What what is the value of Ksp for Ca(OI-I)2? —:> Car-L ~1— 2.0.4" . . E4923 :2 0,0251% - 2 [934;] 1 9‘ OgM Kai-@950“??— . ,r .: o-owxMfi: 1%:wa— ‘3 Swiflflqfi ...
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CW 15 - Class Worksheet 15 1. Acid-Base Indicators - Highly...

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