Acid Base Equilibria Worksheet

3. ACID/BASE EQUILIBRIA

Objective 3.1 - Explain the differences in behavior of strong acid and weak acids using the  Bronsted-Lowr  Bronsted-Lowr !heor

Define the following terms (use a chemical equation whe re appropriate) 1. 2. . ". #. &.

Brons Bronste tedd-Lo Lowr wry y Acid cid Brons Bronste tedd-Lo Lowr wry y Base Base !trong Acid !trong Base $ea% Acid $ea% Ba Base

Objective 3." # $efine the ter%s p&' ( a '  ' p( a '  ' p( b '  ' ( w and p( w

1. 2. . ". #.

Defi Define ne the the ter terms ms'' p p * a p* a p*  + * w and p* w $rit $r itee an equ equat atio ion n for for p p $rit $r itee an equ equat atio ion n for for p, p, $hat is is the relationshi relationship p +etween +etween acid acid strength strength (acidity (acidity) ) * a and p*  + $hat is the relationshi relationship p +etween +etween +asicity +asicity * a and p*  +

Objective 3.3 # )erfor% calculations involving p&' ( a '  ' p( a '  ' p( b '  ' ( w and p( w

1. 2. . ".

alcul alculate ate the p of of a stron strong g acid acid alcul alculate ate the p of of a stron strong g +ase +ase alc alcul ulat atee the the p of of a wea% wea% aci acid d alc alcul ulat atee the the p of of a wea% wea% +as +asee

Objective 3.* # $escribe the changes in p& during acid+base titrations

!%etch titration cures for the following' 1. 2. . ".

!trong !trong acid acid / !tron !trong g +ase +ase titra titratio tion n !trong !trong acid acid / $ea% ea% +ase +ase titrat titration ion $ea% ea% acid acid / !tron !trong g +ase +ase titra titratio tion n $ea% ea% acid acid / $ea $ea% % +ase +ase titrat titration ion

Objective 3., # Explain what is %eant b the p& range of indicator  What is an indicator?

1. $hat $hat is mean meantt +y the the pH range of an indicator0 2. $hat is is the p range range for a) methyl methyl orange orange and and +) phenolphthal phenolphthalein0 ein0

Objective 3. # tate the basis for the selection of acid-base indicator for use in titrations 1. ow do you choose choose an appropriate appropriate indicat indicator or for a titratio titration0 n0 1

Objective 3./ # )erfor% experi%ents to show that the effectiveness of different indicators is related to the p& changes which occur during titrations 1. plain what would +e the effect if an incorrect indicator is selected for an acid-+ase titration.

PRACTICE QUESTIONS

3uestion 1.

3uestion 2

2

3uestion 

3

4

5