Question

Calculate the pH for each case in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq). Use the ionization constant for HClO.

What is the pH before addition of any KOH?

pH=

What is the pH after addition of 25.0 mL KOH?

pH=

What is the pH after addition of 40.0 mL KOH?

pH=

What is the pH after addition of 50.0 mL KOH?

pH=

What is the pH after addition of 60.0 mL KOH?

pH=

Please show work

Answer 1

Helo: Ka= 4x108 pla= -log ka = -log (4x158)= 7.398 © Helot Ho - Hot+ clo 0 1 +x 0.14 Hub XX E 0.14-X EH, ot] [c10] {helo] o.14-X 30.14 . For weak acid 4x100= textos PX0-14 0.0000 7483M X=[Hd -og (0.00007483): 4.1259 pH = -log EH, ot] - Helo: molarity = 0.14M volumea 50ml= 0.052 18 Kolt: molarity = o.lem | uolume=25mi= 0.0252 no- male O-LUX 0-0 25 Moh -0.0035 2035 nooit moles o-14X0.05 = 0.007 Hclot Koh - kelot to Il 0.007 01-1 s -6.00351-0-0035 +0.0035 E10.0035 L o Jo.0035 Total volume = 0.05+ 0.02520.075L -0.0035 =0.04667M 0-025 0.0035 0.075 {kco} -0.046624

pH s pria tiog mellom = 7.38 tleg en pH = 7.398 Kod: Molarity = 0.14 M volume= 40mia 8.042 no-ot moles = 0.14X0-04=0.0056 Helot Koh Kolotto Ilo.oon 1 0.0058 l o L ( -0.0056 -0.0058 +0.0056 El0.0014 10 0 -0056 Toral volume = 0.05+ 0.043 0.09% 0.0050 Ekclo3 = 0.09 0.06221 0 10.01sem [HCO3 - . 0.09 pH= pkatlog [Helo] plt = 7+398 +1990-06 22 71999 -0156

KOH: inolarity = 0.14M CU volume = 50mla 0-052 no ob molesa o.lux 8.05= 0.007 - Itclot Koh - kclot to weak acid strong base salt I 0.007 0.007 L - 0 1 cl-o-oo7 -0.007 tooo7 lo T O 0-0,07 | | Total volume= 0.057 0.05= o.lk 00 [kclo] > 32 om -= 0.07M = [c] For this type of salt pH formula pH = ± [pKW. x platoga] 1 pkwaly pH = z[14+7-398+log (0.07)] = 100122

- Kolt: molarity = 0.14M volumea fomla 0.062 no-ct moles a Olux 0-06 = 0.0084 Helot Kot - kolot H₂O 0-007 10.0084 C-000 -0-002 0 0.0014 Total volumea 0-05+ 0-08 = aille o-oolu - 20.01273 M [KOH? - Soarn v Orll pOH = -108 20H3= -109 (0.01273) : 1.895 pH=14-pOH = 14-1-895= 12.105

pH: formula's for salt's weak acidt strong base ->salft ito pH = Ź [pfw tpka + log c] strong acid & weakbase salf to pH = ₃ [ pk w plebe_loge