© University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare a pH 4.70 solution. K a = 1.8x10 −5 pH Buffer composition

© University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Download PPTX Report

Upload
gillian-anthony
View
212
Download
0

Embed Size (px)

Citation preview

Page 1: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Determine the number of moles of Na(CH3COO) that must be added to 250 mL of 0.16 M CH3COOH to prepare a pH 4.70 solution. Ka = 1.8x10−5

pH Buffer composition

Page 2: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Does a Buffer Stabilize pH?Calculate the initial and final pH when10.0 mL of 0.100 M HCl is added to:

(a) 100 mL of water

(b) 100 mL of a buffer which is 1.50 M in CH3COOH (pKa = 4.74) and 1.25 M in Na(CH3COO)

pH 7.00

pH 4.66 4.65

2.04

Page 3: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Chapt. 16More Acids and Bases

Sec. 1Titration: Chemistry Unplugged

Page 4: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Titration Experiment

acid solutionunknown concentration

strong base solution known concentration

indicator dye changes color

record volume of base

Page 5: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Titration Overview (Strong Acid + Strong Base example)

Titration Curve: a graph of pH of the solution in the flask as titrant (base) is added.

Page 6: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Titration Overview (Strong Acid + Strong Base example)

Equivalence Point: (known) moles of base added equals (unknown) moles of acid in sample.

Page 7: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Titration Overview (Strong Acid + Strong Base example)

Indicator: Added dye that changes color at the equivalence point.

color change

Page 8: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Classroom Titration Problem

The equivalence point in the titration of 20.00 mL of ??? M HCl with 0.1008 M NaOH is at 24.84 mL. What is the concentration of the HCl?

What is the pH of the equivalence point?

Page 9: © University of South Carolina Board of Trustees Determine the number of moles of Na(CH 3 COO) that must be added to 250 mL of 0.16 M CH 3 COOH to prepare

Real Titration Problem

A solution of ascorbic acid has an unknown concentration. A small amount of phenolphthalein (indicator) is added to 25.00 mL of the solution, and it is titrated with 0.100 M NaOH. The first pink color is seen when 18.12 mL of NaOH solution has been added. What is the concentration of ascorbic acid in the original sample?

6.2 SOME STANDARD COMMON NAMES (TO BE ... Hooc-C00H HO-CH-COOH HO-CH-COOH CH2-C00H Ho-c-COOH Oxalic a cid Butyric Mahe Citric (Milk) M (Apple) 6.1 SOME COMMON NAMES BASED ON SOURCE

Documents

Electronic Supporting Information (ESI) forS2 (−PCM6−PLA4−COOH)2, (−PCM7−PLA3−COOH)2, and (−PCM8−PLA2−COOH)2, and (d) thetemperaturespurified (−PCM6−PLA4−COOH)2,

Documents

Fatty Acids Fatty acids have a long hydrocarbon chain with a carboxyl (acid) group Typical for of fatty acids : CH 3 –(CH 2 ) n –COOH 12

Documents

Titrasi Asam Basa - Knowledge Sharing · PDF fileLarutan buffer dengan volume 2.10 L mengandung 0.11 mol asam propionat ( CH 3 CH 2 COOH ) dan 0.10 mol natrium propionat ( CH 3 CH

Documents

Biogenesis of natural acetylenes Biogenetic precursor of the acetylenic substances is oleic acid H 3 C-(CH 2 ) 7 -CH=CH-(CH 2 ) 7 -COOH Oleic acid [18:1(9c)]

Documents

Microstructure, Mechanical and Detonation Properties of ... · ACM CH 2CH CH CH m CH 2 CH n SBR COOH z Figure 1. Molecular formulas of NBR, CNBR, SBR, CSBR, ACM, RTV and PTFE. 2.2

Documents

Synthesis and Biological Activity of Some Amide …...“Synthesis and Biological Activity of Some Amide-Based Cationic Surfactant complexes with ….. 10 | Page CH 3 CH 2 COOH n CH

Documents

$Screening for Microorganisms Producing D-Malate … VAN DER WERFET AL. HOOC-CH-C-COOH 2 1 0 oxaLacetic acid HOOC H 0\C-CH2-COOH OH D-malic acid 6 HOOC-C-0 CH3 0 HOOC COOH \C= / 2 H1~'H$