Volumetric Analysis: Oxidation-Reduction

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Questions and Answers

Match the following compounds with their roles in volumetric analysis:

Potassium permanganate = Oxidising agent Iron(II) ions = Reducing agent Ammonium iron (II) sulfate = Primary standard Sulfuric acid = Source of H+ ions

Match the following descriptions with the respective compounds used in titration:

KMnO4 = Acts as its own indicator Fe2+ = Converted to Fe3+ Ammonium iron (II) sulfate = High purity and stable in air

Match the following steps with their corresponding actions in the experiment:

Rinse burette = With potassium manganate(VII) solution Fill pipette = With iron(II) solution Acidify conical flask = Add dilute sulfuric acid Adjust burette = To zero before titration

Match the following ions with their respective redox changes:

MnO4^- = Mn2+ Fe2+ = Fe3+ H+ = No change MnO4^- with Fe2+ = Requires 5 Fe2+ ions Signup and view all the answers

Match the following laboratory equipment with their usage in the experiment:

Pipette = Transfer iron(II) solution Burette = Deliver potassium manganate(VII) solution Conical flask = Hold the reaction mixture White tile = Enhance visibility of color change Signup and view all the answers

Match the following reactions with their appropriate electron transfer details:

MnO4^- + 8H+ + 5e^- → Mn2+ = Oxidation process Fe2+ → Fe3+ + e^- = Reduction process MnO4^- + 5Fe2+ + 8H+ → Mn2+ + 5Fe3+ + 4H2O = Overall redox reaction Fe2+ + e^- → Fe3+ = Electrons lost Signup and view all the answers

Match the following factors with their relevance in the titration process:

Precision = Accurate measurements critical Concentration = Determines rate of color change Purity = Ensures reliable results Indicator = Indicates endpoint during titration Signup and view all the answers

Match the following characteristics with the substances in the titration:

Potassium permanganate = Intense purple color Iron(II) ions = Pale green solution Sulfuric acid = Colorless liquid Ammonium iron (II) sulfate = Stable under air exposure Signup and view all the answers

Match the following laboratory techniques with their descriptions:

Titration = Determining the concentration of a solution Filtration = Separating solids from liquids Evaporation = Concentrating solutions by removing solvent Distillation = Separating components based on boiling points Signup and view all the answers

Match the reactants in the redox reaction with their roles:

MnO4^- = Oxidizing agent Fe^2+ = Reducing agent H+ = Acid catalyst H2O = Product of the reaction Signup and view all the answers

Match the variables with their definitions in volumetric analysis:

Vo = Volume of oxidizing agent Vr = Volume of reducing agent Mo = Molarity of oxidizing agent Mred = Molarity of reducing agent Signup and view all the answers

Match the chemical compound with its formula:

Potassium permanganate = KMnO4 Sulfuric acid = H2SO4 Ammonium iron(II) sulfate = (NH4)2Fe(SO4)2·6H2O Water = H2O Signup and view all the answers

Match the mass concentration values with their units:

0.12 M = Moles per liter 3.997 g/L = Grams per liter 25 cm^3 = Volume measurement 158 g/mol = Molar mass Signup and view all the answers

Match the steps in preparing a solution with their order:

Crush iron tablets = Step 2 Weigh iron tablets = Step 1 Dissolve in sulfuric acid = Step 2 Make up to the mark = Step 3 Signup and view all the answers

Match the end-point observation with the technique used:

Pale pink color = Titration Gas bubbles = Filtration Crystals forming = Evaporation Liquid separation = Distillation Signup and view all the answers

Match the term with its corresponding value in the titration:

Average titration figure = 23.75 cm^3 Moles of Fe^2+ = 5 Moles of Mn^O4^- used = 1 Iron tablet mass = Measured in grams Signup and view all the answers

Match the following solutions with their uses in the experiment:

Iron(II) solution = Reactant for titration Potassium manganate(VII) = Titrant solution Dilute sulfuric acid = Acidifying agent Deionised water = Washing and rinsing Signup and view all the answers

Match the following steps with their corresponding actions:

Wash pipette, burette, and flask = Preparation for titration Fill pipette with iron(II) solution = Sample transfer Fill burette with potassium manganate(VII) = Setting up titration Add solution from burette to flask = Conduct titration Signup and view all the answers

Match the following indicators with their descriptions:

First persisting pink colour = End-point of titration White tile = Surface for observing color change Dropwise addition = Approaching end-point cautiously Meniscus reading = Accurate volume measurement Signup and view all the answers

Match the following substances with their properties:

Iron(II) ions = Reduced state of iron MnO4^- ions = Oxidizing agent Fe^3+ ions = Oxidized state of iron H^+ ions = Acidic environment Signup and view all the answers

Match the following measurements with their values:

Total mass of five tablets = 1.2 grams Volume used in titration = 5.75 cm^3 Volume of solution made up to = 250 cm^3 Volume of sample taken for titration = 25 cm^3 Signup and view all the answers

Match the following components with their associated calculations:

Concentration of KMnO4 = 0.015 M Moles of MnO4^- reacted = 1 mole Stoichiometry ratio of MnO4^- to Fe^2+ = 1:5 Calculated moles of iron in 25 cm^3 = 0.0173 moles Signup and view all the answers

Match the following chemical reactions with their products:

MnO4^- + Fe^2+ = Mn^2+ + Fe^3+ MnO4^- + H^+ = Mn^2+ + H2O Fe^2+ oxidation = Fe^3+ H^+ neutralization = Water formation Signup and view all the answers

Match the following terms with their definitions:

Titration = Quantitative chemical analysis method Stoichiometry = Study of reactant ratios Endpoint = Conclusion of titration process Concentration = Amount of solute per volume of solution Signup and view all the answers

Match the following formulas with their respective compounds:

FeSO₄ = Iron(II) sulfate Na₂S₂O₃·5H₂O = Sodium thiosulfate pentahydrate KIO₃ = Potassium iodate H₂SO₄ = Sulfuric acid Signup and view all the answers

Match the following laboratory equipment with their uses:

Pipette = To measure and transfer precise volumes of liquid Burette = To dispense variable amounts of liquid, especially during titration Conical flask = To mix and swirl solutions during titration Graduated cylinder = To measure volumes of liquids accurately Signup and view all the answers

Match the following calculation results with their corresponding parameters:

Mass of iron in each tablet = 0.049 g Percentage of iron in FeSO₄ = 36.84% Mass of one tablet = 0.24 g % FeSO₄ in each tablet = 55% Signup and view all the answers

Match the substances with their roles in the titration procedure:

Sodium thiosulfate = Titrant used to standardize against iodine Potassium iodate = Analyte solution reacted in the conical flask Sulfuric acid = Acidifier for the reaction Starch solution = Indicator for the endpoint of the titration Signup and view all the answers

Match the following volume measurements with their conversions:

25 cm³ = 0.025 L 250 cm³ = 0.250 L 20 cm³ = 0.020 L 27.45 cm³ = 0.02745 L Signup and view all the answers

Match the following steps with their order in the titration process:

Rinse equipment = 1 Add starch indicator = 6 Note burette reading = 7 Repeat procedure for consistency = 8 Signup and view all the answers

Match the calculation tasks with their formulas:

Concentration of sodium thiosulfate (moles/L) = $\frac{C_1V_1}{V_2}$ Mass of sodium thiosulfate (grams/L) = $\text{Moles} \times \text{molar mass}$ Percentage of FeSO₄ in tablet = $\frac{0.132}{0.24} \times 100$ Mass of FeSO₄ in volumetric flask = $\frac{2.63}{4}$ Signup and view all the answers

Match the following terms with their definitions related to the titration process:

Starch = Indicator used to determine the endpoint of a titration Thiosulfate = Chemical used to react with iodine in titrations Conical flask = Container used to hold the solution during titration White tile = Surface used to enhance visibility of color change Signup and view all the answers

Match the following compounds with their functions in the titration experiment:

NaClO = Active ingredient in bleach Iodine = Oxidizing agent that is reduced in the reaction Sodium thiosulfate = Reducing agent that reacts with iodine Potassium iodide = Keeps iodine in solution for the reaction Signup and view all the answers

Match the following values with their respective calculations or outcomes:

16.1 cm³ = Average volume of sodium thiosulfate required 0.0322 moles/L = Concentration of NaClO in diluted bleach 47.978 g/L = Concentration of NaClO in original bleach in grams per litre 4.7978 % (w/v) = Concentration of NaClO as a percentage (w/v) Signup and view all the answers

Match the following chemical species with their roles in the titration reaction:

I₂ = Substance that is reduced by sodium thiosulfate S₂O₃²⁻ = Ion that serves as a reducing agent S₄O₆²⁻ = Product formed after reaction with iodine I⁻ = Iodide ion produced as a product during the titration Signup and view all the answers

Match the following statements with their corresponding reasons during the titration procedure:

Standing conical flask on a white tile = Improves visibility of the color change Use of excess potassium iodide = Ensures complete reaction with all bleach present Addition of sodium thiosulfate = Determines the end-point of the titration Color change from blue to colourless = Indicates the completion of the reaction with starch Signup and view all the answers

Match the following concentrations with their corresponding types:

0.077 moles per litre = Concentration of NaClO in diluted bleach 0.77 moles per litre = Concentration of NaClO in original bleach 57.37 g NaClO per litre = Mass concentration of NaClO in original bleach 5.74 % w/v = Weight/volume percentage of NaClO in original bleach Signup and view all the answers

Match the following steps with their descriptions in the dilution process:

Pipette = Transfer exact volume of bleach to volumetric flask Add deionised water = Fill the flask until it approaches the graduation mark Read at eye level = Ensure accurate measurement of liquid height Invert several times = Mix the solution to ensure homogeneity Signup and view all the answers

Match the following chemical reactions with their respective products:

ClO^- + 2I^- + 2H^+ = Cl^- + I2 + H2O 2S2O3^2- + I2 = S4O6^2- + 2I^- Reaction with Sulfuric acid = Generation of iodine Potassium iodide = Provides I^- ions for the reaction Signup and view all the answers

Match the following quantities with their calculated values:

Volume of diluted bleach = 500 cm^3 Initial volume of bleach used = 25 cm^3 Volume used for titration = 25.0 cm^3 Molecular mass of NaClO = 74.5 g/mol Signup and view all the answers

Match the following steps with their outcomes in the titration process:

Using a pipette = Accurate measurement of diluted bleach Titration against Na2S2O3 = Determining concentration of NaClO Adding sulfuric acid = Acidifying the solution for reaction Excess of potassium iodide = Ensures all available ClO^- reacts Signup and view all the answers

Match the following concentration types with their appropriate formula:

Molarity (M) = $rac{moles}{volume ext{ (L)}}$ Mass concentration = $rac{grams}{volume ext{ (L)}}$ Weight/volume percentage (w/v) = $rac{grams}{100 ext{ cm}^3}$ Dilution factor = $rac{V_{original}}{V_{diluted}}$ Signup and view all the answers

Match the following titration components with their roles:

Conical flask = Holds the reaction mixture for titration Burette = Delivers titrant solution during titration Indicator = Signals endpoint of titration Titrant = Solution of known concentration Signup and view all the answers

Match the following reactions with their respective reagents:

ClO^- and I^- ions = Oxidation-reduction reaction Thiosulfate ion = Reduces iodine back to iodide Sulfuric acid = Provides H^+ for the reaction Potassium iodide = Serves as a source of I^- Signup and view all the answers

Study Notes