Question

Calculations The following calculations are necessary to complete your Report Sheet. Consult the table on page 119 for appropriate K and K, values. Complete these calculations on your Report Sheet for complete credit. I. pH of Strong and Weak Acids 1. Calculate the pH of a 0.10 M hydrochloric acid solution, HCl(aq). 2. Calculate the pH of a solution prepared by diluting 5.00 mL of 0.10 M hydrochloric acid, HCl (aq), in enough water to make a 50.0 mL solution. 3. Calculate the pH of a 0.10 M acetic acid solution, CH,COOH (aq). II. pH of Strong and Weak Bases 1. Calculate the pH of a 0.10 M NaOH (aq) solution. 2. Calculate the pH of a 0.10 M sodium acetate solution, CH,COONa (aq).

Answer 1

1. Ach, strong and so Cut] 2 2 M 2 nonize completely [no 20.10 m log [ft) 2 tog Co.10) <1 1 7) Chci za CHC) [at) moles & Hel Total volume 2 o-lomx sooml Jo-0mL zo-olom. 2 log Co-dom) = (2-0) , weak acid (no rohire е сисоб + o PH CH₂cool си, соод 0-10m completely) it ju x 0.10 k neglect & as Kacio Ka & Cazcoo) Cut) [cycoot] 18x100 2 x² o lose II,-) - Cht) a x 2 Josxloxolom = 0.0011m. 2) pH = 12-89) (2 decimalo powrs) naor , strong base , so Cont) 2 0-10m 2) por 2 1.0 pH 2 14.0-1.0 213.0] CH₂ Coona (Salt) Chycoo is consugatan weak and CHCOom, so acts as base chcoo the chcool TOH 2) of k. 2 [ethcool) COH) Cortcool. 95.6x10ta x² o-lom

Cor 2 x 2 7.5 x 106m. poh z pH z 5012 14-00 - 5.12 213-88.) neutral ron (conjugate lan of strong acla) acid or weak base Mu OH Noit so is conjugate acts as and Nhat tho o-lom 0.10- i NHOH + Ht І ох la 2 (Why Oh) Cift) x & 2) Cut) a Cut) a (wirtyt ] J5.6x10to x o-lom 7.5x105m. I Hot & Ho Ho- 2 0out. (HCG acts as He is amphoteric (Kaz) acts and a both acid Actually and base Hcon acts bose ao as Acost tho & theo + on (ko for amphurenc, PH 2 pkai + plar 2 log kay & -logka, 2 -10g (4-yx107) + -log[4.7x1071) 18.34

cor & ho 2 uca ton 0-10- neglect x 2 * 6-10- Corfzx 2 2.18104 x 0-10 2 4.6 x 103 m. 2) pon a 2.34 2) pH a 14.00 -2.342 11-66 mores a mass molar mass 4.2009 82-03379 g/mol 0.05120 moles moles of miles pilan acetate nons & moles & choo na Cercoo) a 0-05120 moles E sl. 20 x 103 moks acere and 2 May 26.0mx 8.5m x 103 - 51x103 moles. log (1.88165 a 4.74. Chycoo is base (coon & acd 424 tlog [ 51-20x10 moles) 100m = I sl xiomoles = 4.74 loomt when reacts He and moles added base component (CH₂Coo) form weak ald. he added a 6.omx lomi xol 2 60x 103 moles. cu,ooh Chacoo + Ht l 51-20x103 6x103 - GR103 -6x10 45.20x103 C Tix03 +6x103 5*** 10 3 mies

PM z pleca + log [erico 2 34 109 (Las cores de 2 4.64. buffer reals 5 moles naoh added a 6.0x103 moles when Shong base added, and component of сисон tоит сисоб «и, о I 51x103 moles 6-ox 103 moles 51-2006 C -6X163 8x183 +68100 F 45x163 57.20 x 103 ㅂ 나 pH 2 4.74 + log (57.20 x 103) 45 x 103 4-84 2 City 2 moles Hol Total volume 2 G.om x 10ml 41-0ml COH) 2 G-omxtome 4l-oml Calculate pom then pH. 8 change in pH of butter less than that of pure waren. Cinitial pH of pure water 27)