Question

A 100 mL sample of 0.060 M is titrated with 0.060 M EDTA at pH 9.00. The value of Kf for the Ca^2+ -EDTA complex is 10.65 and the fraction of free EDTA in the Y^4- form, ay+ , is at pH 9.00. The Y4- was not given how am i suppose to solve this.

What is Kf' , the conditional formation constant, for CA^2+ at pH 9.00?

What is the equivalence point volume, Ve, in milliliters?

Calculate the concentration of Ca2+ at V=1/2Ve

Calculate the concentration of Ca^2+ at V=Ve

Calculate the concentration of Ca^2+ at V=1.1Ve

Answer 1

24 is notation of full de forotomated form of EDTA. 84 react with cartas cart 74 care- The Teaction formation constant for this k. I'caya) - Eca 2-1 [lv] ---- here, geven ufu 10.65. It is not corect. It would be - 10.65 logy - 1065 = 101065- 4.5x1010 n + y] Fully prosto nated 2014 is a hera Brolie acid & can be expressed as Heyet AT I EDTA) for = 16 24+ THs y ++ [HyY). + City) & [hy] + Hy 27 Praction of her cappel Lyu TEDTA .: 89 choyen * CEDtaltor plugging Chwil value into ecuation

care TEDTA tot kr [Ca 2+] x Layu- & to .... ) [cay2-) - kfx Lyn- - - - - ceayer [CAR] [ EDTA A en (bis) K} = 10991) CB01HD for if the conditions formation constant - kfx Lagu [here, = "гх/u/0х ч xin - Хуу - а/ рН 9-00 5:48 10-2 = 2.430109 .: 32 = 243X1097 It canivalence point inolesof EDTA – moles of Ca2+ =) MEDTAX VEDTA = Marx Vear mamolarity Ve volume) 0.006 in x Vro - 00bges x100mm VEDTA 180 m : volume of EDTA reanired to reach equivalence point (ve) = 100ny at volare- 2x100 sat = som EDTA rearurear At V=have in at som EDTA addition au Mat & Veart – MPOTA X VEDTA Neart & VEDTA (0.060 x 1000 (0.060x50). in +50) = 0.02 M

. At verore, ecart)= 0.02 en At vove All the cart will be converted to Cayz So, here in scotion ticarth will be due to dissociation of cape- First we have to corculate (carz-] Grities mets of cast [cap] – – total volume Мал 24 хva2+ Veart & VEDTA d'o6o x 100 M = 100+100) 0.03OM tom n caya dissociates as cay?- Calt & 74- Initial: 0.030 M : - M tom Equim: (0.030-2) em um Love, par in the total EDTR. I . At equivalence point H EPTA) tot- &M. i varing earation (ii) [cay2] - 0.030 xf = Cart) (ED A tot

0.03 22 n = na ng 0.03 0 i association condition constant Ky is very large - 0.030 Si, disociation 2.43 8109 constant acillle. very smal 2.43x109 So, 0.000-x - 0.037 - 3.5818-6 M (ca 2t) at canivalence point in 35x256m. At ve slave i. & 17 8100 or llore here, or auill be more all cast auss be converted to cayer MEDTA VEOT - Mcart CEDTA tot = card VEDTO & Vat 6.08 X10 ) - 0.06 XIon 10400) .- 286X/0"3 M Acher cancera ance point [capt.) Grutial moles of card Total volume Mart Nearr Partit VEDRA 0'06 x 100 m - 11 - 8.8286 m using caration sinn 2.43x10? - - 0.0286 [cart] 2.86X/03 .: Paz [ca2 = 0.0286 2 193x109 2 186 187 4 At vo live , [cart] 42 x 189 S