pKa of acetic acid= 4.744

su 13.21 Part IV: Dilution of Buffered and Unbuffered Solutions Calculated pH | Calculated ApH Observed pH Observed ApH Number Preparation 15 ml. HC H3O2(aq) 15 ml NaC,HO2(aq) 5 ml Solution 1 25 mL H20 5 ml Solution 2 25 ml H20 4 30 mL HC H2O2(aq) 5 ml Solution 4 25 ml H2O 5 ml Solution 5 25 ml. H2O 4.10 4.10 4.10 06 2. 37 2.168 Part V: Adding Strong Acid or Base to Unbuffered Solutions Concentration of HCI .0 M Preparation Calculated pH Calculated ApH Observed pH Observed pH Beaker 1 30 ml H2O (6.78 30 ml H20 2 ml. -1.0 MHCI 1.39 30 ml. H2O 2 ml. -1.0 M NaOH 30 ml. HC H2O2(aq) 30 ml NaC2H3O2(aq) 30 ml buffer 2 ml -1.0 MHCI 30 ml buffer 12 ml -1.0 M NaOH 12.39 4.23 410 4.42

Section Iructor Part I: The pH of Acetic Acid and Sodium Acetate Solutions Calculated pH (2) NaC,HO,(aq 0.5m 0.5m 202 2.0l 9.22 Part I: Direct Method – Preparation of Buffer Solutions Volume of -0.50 M NaC,H,O2 (mL) Volume of -0.50 M HỆ | 0 HLV Calculated pH Observed System ID – 2.99 3.59 3 15 3.744 4.142 4.144 5.346 5.744 في عام 4.10 4.74 5.36 Part II: Indirect Method – Preparation of Buffer Solutions Concentration of NICH 1.0 M Addition N aOH (ML) Total Volume NaOH (ML) 10 Calculated pH 니 니 4,744 9.13 13.30 Observed pH 3.46 4.12 5.76 13.2 3 10 Part IV: Dilution of Buffered and Unbuffered Solutions Calculated pH Calculated pH Observed pH Observed pH Preparation 15 ml. H ogy 115 ml NaC,H,O, 5 ml Soluson 125 ml. O 410 14.10 4.10 5 ml Solution 2 4 30ml HG,H,O,(aq) 5 ml Solution 4 125 ml H,O 5 ml Solution 5 2.37 2.168 SILHO Part V: Adding Strong Acid or Base to Unbuffered Solutions Concentration of HCI 1.0 Beaker Preparation Calculated pH 1 30 ml. H2O Calculated pH Observed pH observed ApH 2 POLHO 12 ml -1 0 MHCI 1.39