CW 6 - CHM 2046. - Worksheet 6 pH find Kw 1- pH=...

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Unformatted text preview: CHM 2046. - Worksheet 6 pH find Kw 1- pH= -10310[H30+1 Note; HCl is a strong electrolyte: HCl(g or aq) + H200) -—> H30+(aq) + Cl'(aq) (a) For 0.035 MHCI, [0130+]: Q: 035M _ f (b) For 0.036MHC1, [1130+]: O! 0351‘? PM .01wa Ca cgde a; I? 010.}DH- PHI=_‘".4£Q¥- Q - ‘ +0.». .I 9599/. [ME/3 WI;(ST§C{N~£ w M ’0'.) 3 or W “Héwafifl‘ilfio gig nific n: figu [es when aficulating a 611? 5 5.1/00 [WW] : NW; “’3 vafl’ (c) For 0.002 M HCl, 7 9 pH: 01 I q— - {2H - T] _, 2. Work this backwards, using the observed pH to find [1430+]: Z830 ~ 1 O 0 #0 (a)prH=3.5,then: . [1430+]: 3 mo M. . I —--——F PSI“ (b) prH=4.27, then: [1130+] = 5 14 x10 ‘ 3. 2 H200) :1-H30+(aq) + OH-(aq), Kw= [H3o+][0H-] = 1.0x 10—14 (at 25°C) Given either H3O+ or OH', you can calculate the other, and the pH. ‘ EM? : Kw M Etgofl : Kw (a) For 0.02 M HCl, [030+] @‘j [H30+]= 0* 01M [OH-]= '5 x1043”) pH: 14 (b) For 0.03 M NaOH, [H30+]=_}_><\'_O':’fl [OH-]= 003M pH: [90.6 (c) For 0.012 M Ca(OH)2, 4; [H30+]= {MM M [OH']= 0: ()1th pH= iii-(038‘ 4. For “pure” water, find values for all of these. 2 H200) z: H3o+ + OH-(aq), I O O C air-'74. + 34. E %- "Vb .- 2.9? r a _ [H30+]=l+@><\0 (“l .._7 / [OH-1: mer N KW = [H3 0+] [OH'] H“. Wm ' : 34. 7 ..-— 2.. zrflxto’ M (2,4)?) \l, 7%- pH 5. The “p” in pH is a mathematical operator. Find the “p” version of Kw = Km :: 5430+] [Bl/Ii a M as? [v3.0 filo-4h ::_7 ’lcaa 4§" 7 Ag - \ Egg-0*? [H 9M3 Flajlggxlo "d g. 00} w .. K 7H:OD:'\03 H791“ fiéserHKw 'lq‘oo : PM + PO If F PH:[email protected]/ 330”: 6. Complete the table. Practice the keystrokes on your own calculator. Solution [H30+] I [OH-] pH pOH (a) 0.1 MHCI (Example) 0.1M 1x10-l3 1.0 110 (b) 0.0155MHC1 Glplgam 5'94’043 1.310 til-lam (c) 0.25MNaOH LA‘VQ‘OAUM (0.15M ‘3'“? 9'60 "* 3x HfH M '3 e 'Nofinm lot 6, (d) 37%} MHCl = 35 (e) L‘ 05 MNaOH a, we"; M 0- 067% m p .3 ...
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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.

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CW 6 - CHM 2046. - Worksheet 6 pH find Kw 1- pH=...

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