Solutions to Chem 321 | Lecture Note - Edubirdie

University:
California State University, Northridge
Course:
CHEM 321/L | Chemical Analysis I and Lab
Academic year:

2013
Views:

17

Pages:

1
Author:

Kailyn Pham

Solutions to Chem 321 Work Group Set 4 Questions Acids and Bases For each of the following multiple-choice questions, circle the letter preceding the correct (best) answer. Only one answer will be accepted for each. The conjugate acid of H2C2O4 is: A. H3O+ B. H3C2O4+ C. HC2O4- D. C2O42- Is an aqueous solution of each of the following substances acidic, basic or neutral? Explain. Write a balanced equation for the reaction that determines this. (F- is a weak base - the conjugate base of a weak acid, HF) NaF - basic F- + H2O LiNO3 - neutral X HF + OH- (NO3- is a nonbase - the conjugate base of a strong acid, HNO3) H2O + H2O KHCO3 - basic X H3O+ + OH- (Since HCO3- is an amphiprotic substance, you must determine whether base hydrolysis or acid dissociation is more important. This is done by comparing the equilibrium constants for these two reactions. º H3O+ + CO32- HCO3- + H2O Ka HCO3- + H2O Kb º H2CO3 + OH- Notice that Ka is the same as Ka2 for H2CO3 and equals 4.69 x 10-11. Kb must be calculated from Ka for the conjugate acid (H2CO3) [Kb = 10-14/4.45 x 10-7 = 2.25 x 10-8]. Since Kb >> Ka for HCO3-, the base hydrolysis process is more important and we can treat this problem as a weak base in solution.

Related Documents

Solutions to Chem 321

Solutions to Chem 321 - Page 1

of 1

Recommended Documents

Acid-Base Equilibria & Titrations

Acid-Base Equilibria & Titrations

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lab

Chem 321 Lecture 10 - Acid-Base Equilibria

Chem 321 Lecture 10 - Acid-Base Equilibria

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Calibration of Burets and Pipets

Calibration of Burets and Pipets

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Chem 321 Lecture 5 - Experimental Errors and Statistics

Chem 321 Lecture 5 - Experimental Errors and Statistics

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Chemical Analysis Lecture 17 - Potentiometry

Chemical Analysis Lecture 17 - Potentiometry

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Gas Chromatography - Study Materials

Gas Chromatography - Study Materials

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lab

Chem 321 Lecture 22 - Gas Chromatography

Chem 321 Lecture 22 - Gas Chromatography

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Complexometric Titrations

Complexometric Titrations

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Experimental Errors and Statistics

Experimental Errors and Statistics

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

Solutions for Chemical Activities Exercises

Solutions for Chemical Activities Exercises

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Answer Key

Solutions for Complexometric Tatrations Exercises

Solutions for Complexometric Tatrations Exercises

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Answer Key

Atomic Absorption Spectrophotometry

Atomic Absorption Spectrophotometry

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lecture Note

New Documents from this Course

Citric Acid Cycle: Central Role in Catabolism

Citric Acid Cycle: Central Role in Catabolism

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Study Guide

High Performance Liquid Chromatography

High Performance Liquid Chromatography

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lab

The Chemistry of Oil

The Chemistry of Oil

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Study Guide

433 IR Сorrelations

433 IR Сorrelations

California State University, Northridge CHEM 321/L | Chemical Analysis I and Lab

Lab