Midterms Flashcards
A plot of the p-function of the analyte (or titrant) concentration against the volume of titrant added
Sigmoidal Titration curve
Titration is done on both sides of, but well away from the equivalence point
Linear Segment curve
Usually used with the help of an analytical instrument.
Linear segment curve
Give the two standard solution
Strong acid and strong base
Give example of strong acid and strong base
HCI,HCIO4, H2SO4
Base
NaOH, KOH, Ba(OH)2
Popular method of analysis due to its
RELATIVE EASE
SPEED
LOW-COST
Acid-Base Titration
Factors for Successfully Titration
AFM
Availability of suitable titrant
Fast and quantitative reaction
Means of estimating equivalence point
Is a weak organic acid or weak organic base whose undissociated form differs in color from its conjugate acid or its conjugate base form(SOLVATOCHROMIC)
Indicators
Occurs when the pH at which the indicator changes color differs from the pH at the equivalence point
Can be minimize by choosing the indicator carefully or by making blank correction
Determinate error
Originates form the limited ability of the eye to reproducibly distinguish the indeterminate color of the indicator
Average visual uncertainty +- 0.5 to +-1 pH
Indeterminate Error
Temperature
Ionic strength of the medium
Presence of organic solvents
Colloidal particles
Variables that Influence the Behavior of the Indicators
Plots PH as a function of the volume titrant added
Follows the progress of the titration process
Measured experimentally or Calculatex using equations from the principles of equilibrium
Titration Curves
Only the analyze exists in the solution pH is determine by the analyte
Initial Point
Every addition of acid titrant reacts with the base analyte to form salt and water
At this region, the acid is the Limiting Reagent while the base is the EXCESS reagent
Region Before Equivalence point
Complete neutralization of the analyte by the titrant
Only the salt and water product is present in the solution
At Equivalence Point
