MIDTERM 02 - Redox Titrations Flashcards
Reactions that involve transfer of electrons; occurs between a reducing and oxidizing agent
Redox reactions
A strong oxidizing agent with an intense violet color
Potassium permanganate
Type of titration - Standardization of 0.1 N KMnO4
Direct titration
Type of reaction - Standardization of 0.1 N KMnO4
Redox reaction
Analyte/reducing agent - Standardization of 0.1 N KMnO4
Sodium oxalate (Na2C2O4)
Titrant/oxidizing agent - Standardization of 0.1 N KMnO4
Potassium permanganate (KMnO4)
Acidifying agent - Standardization of 0.1 N KMnO4
Sulfuric acid (H2SO4)
Factor of analyte - Standardization of 0.1 N KMnO4
2
Indicator -Standardization of 0.1 N KMnO4
None (KMnO4 is a self-indicator)
Color transition - Standardization of 0.1 N KMnO4
Colorless to pale pink
Used as a reducing agent; it is a colorless acid
Oxalic acid
Is a mild, fast acting, oxidizing germicide
Hydrogen peroxide topical solution USP
Type of titration - Assay of hydrogen peroxide (H2O2)
Direct titration
Analyte - Assay of hydrogen peroxide (H2O2)
Hydrogen peroxide (H2O2)
Titrant - Assay of hydrogen peroxide (H2O2)
Potassium permanganate (KMnO4)
Acidifying agent - Assay of hydrogen peroxide (H2O2)
Sulfuric acid (H2SO4)
Factor of analyte - Assay of hydrogen peroxide (H2O2)
2
Type of titration - Assay of cherry juice for malic acid (C4H6O5)
Indirect titration
Type of reaction - Assay of cherry juice for malic acid (C4H6O5)
Redox reaction
Analyte/reducing agent - Assay of cherry juice for malic acid (C4H6O5)
Malic acid (C4H6O5)
Titrant/oxidizing agent - Assay of cherry juice for malic acid (C4H6O5)
Potassium permanganate (KMnO4)
Acidifying agent - Assay of cherry juice for malic acid (C4H6O5)
Sulfuric acid (H2SO4)
Type of titration - Assay of sodium nitrite (NaNO2)
Double residual titration
Type of reaction - Assay of sodium nitrite (NaNO2)
Redox reaction
Analyte/reducing agent - Assay of sodium nitrite (NaNO2)
Sodium nitrite (NaNO2)
Excess titrant/oxidizing agent - Assay of sodium nitrite (NaNO2)
Potassium permanganate (KMnO4)
Acidifying agent - Assay of sodium nitrite (NaNO2)
Sulfuric acid (H2SO4)
Backtitrant/reducing agent - Assay of sodium nitrite (NaNO2)
Oxalic acid (H2C2O4)
Factor of analyte - Assay of sodium nitrite (NaNO2)
2
Precipitated calcium carbonate - type of titration (Permanganometry)
Indirect titration
Precipitated manganese dioxide - type of titration (Permanganometry)
Indirect titration
Dibasic calcium phosphate - type of titration (Permanganometry)
Indirect titration
Titanium dioxide (with blank determination) - type of titration (Permanganometry)
Indirect titration
Potassium permanganate tablets - type of titration (Permanganometry)
Residual titration
Lead oxide (with preliminary treatment) - type of titration (Permanganometry)
Residual titration
Strong oxidizing agent and considerably more stable than KMnO4 in acid medium
Cerium (IV) sulfate [Ce(SO4)2]
Used as an indicator in cerimetry
Orthophenanthroline TS
Acidifying medium - Standardization of 0.1 N Ce(SO4)2
Sulfuric acid (H2SO4) and hydrochloric acid (HCl)
Primary standard - Standardization of 0.1 N Ce(SO4)2
Sodium oxalate (Na2C2O4)
Heat requirement - Standardization of 0.1 N Ce(SO4)2
70°-75°C
Heat requirement - Standardization of 0.1 N KMnO4
60°-70°C
Type of titration - Standardization of 0.1 N Ce(SO4)2
Direct titration
Color transition - Standardization of 0.1 N Ce(SO4)2
Colorless to pale yellow
Factor of analyte - Standardization of 0.1 N Ce(SO4)2
2
Type of reaction - Assay of ferrous sulfate tablets (FeSO4.7H2O)
Redox reaction
Type of titration - Assay of ferrous sulfate tablets (FeSO4.7H2O)
Direct titration
Indicator - Assay of ferrous sulfate tablets (FeSO4.7H2O)
Orthophenanthroline TS
Color transition - Assay of ferrous sulfate tablets (FeSO4.7H2O)
Colorless to permanent pink color
Factor of analyte - Assay of ferrous sulfate tablets (FeSO4.7H2O)
1
Ferrous sulfate - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Ferrous fumarate - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Ferrous gluconate oral solution - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Ferrous gluconate tablets (with preliminary treatment) - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Hydroquinone - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Menadione - type of titration (Cerimetry)
Direct titration (w/ blank determination)
Ringer’s solution for KCl content - type of titration (Cerimetry)
Residual titration
Direct titration of reducing substances using iodine (I2) as volumetric standard
Iodimetry
Indirect titration of oxidizing substances reduced by excess iodide to liberate I2
Iodometry
Indicator of choice in iodimetry and iodometry because it forms an intense blue complex with iodine
Starch
2 types of starch
Soluble starch, Insoluble starch
includes β-amylose
Soluble starch
Includes α-amylose and amylopectin
Insoluble starch
Is a molecule of repeating sugar units joined by α-1,4 linkage
Amylose
Has both α-1,4-glycosidic bonds and α-1,6 bonds to branches
Amylopectin
Iodimetry or iodometry - Standardization of 0.1 N Iodine (I2)
Iodimetry
Type of chemical reaction - Standardization of 0.1 N Iodine (I2)
Redox reaction
Factor - Standardization of 0.1 N Iodine (I2)
2
Type of titration - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Direct iodometry
Type of reaction -Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Redox reaction
Analyte/oxidizing agent - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Potassium dichromate (K2Cr2O7)
Titrant/reducing agent - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Sodium thiosulfate (Na2S2O3)
Acidifying agent - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Hydrochloric acid (HCl)
Reducing agent for K2Cr2O7 - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Potassium iodide (KI)
Indicator - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Starch TS
Color transition - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
Blue to colorless
Factor - Standardization of 0.1 N sodium thiosulfate (Na2S2O3)
6
Antimony potassium tartrate - type of titration (Iodimetry)
Direct titration
Antimony potassium tartrate - Iodimetry or Iodometry
Iodimetry
Dimercaprol - type of titration (Iodimetry)
Direct titration
Dimercaprol - Iodimetry or Iodometry
Iodimetry
Sodium ascorbate - type of titration (Iodimetry)
Direct titration
Sodium ascorbate - Iodimetry or Iodometry
Iodimetry
Sodium thiosulfate - type of titration (Iodimetry)
Direct titration
Sodium thiosulfate - Iodimetry or Iodometry
Iodimetry
Sulfur dioxide - type of titration (Iodimetry)
Direct titration
Sulfur dioxide - Iodimetry or Iodometry
Iodimetry
Isoniazid - type of titration (Iodimetry)
Residual titration
Isoniazid - Iodimetry or Iodometry
Iodimetry
Mild mercurous chloride - type of titration (Iodimetry)
Residual titration
Mild mercurous chloride - Iodimetry or Iodometry
Iodimetry
Methionine - type of titration (Iodimetry)
Residual titration
Methionine - Iodimetry or Iodometry
Iodimetry
Arsanilic acid - type of titration (Iodometry)
Direct titration
Arsanilic acid - Iodimetry or Iodometry
Iodometry
Chromic chloride - type of titration (Iodometry)
Direct titration
Chromic chloride - Iodimetry or Iodometry
Iodometry
Cupric sulfate (with blank determination) - type of titration (Iodometry)
Direct titration
Cuprous sulfate (with blank determination) - Iodimetry or Iodometry
Iodometry
Selenium sulfide (with blank determination) - type of titration (Iodometry)
Direct titration
Selenium sulfide (with blank determination) - Iodimetry or Iodometry
Iodometry
Sodium hypochlorite solution - type of titration (Iodometry)
Direct titration
Sodium hypochlorite solution - Iodimetry or Iodometry
Iodometry
Thyroid - type of titration (Iodometry)
Direct titration
Thyroid - Iodimetry or Iodometry
Iodometry
Sodium borohydride - type of titration (Iodometry)
Residual titration
Sodium borohydride - Iodimetry or Iodometry
Iodometry