RP1

• What is the first step in making a volumetric solution?

  Record the difference in mass of the weighing boat
• Why is distilled water added to the beaker when making a volumetric solution?

  To dissolve the solid completely
• What should you do after pouring the solution into a volumetric flask?

  Rinse the beaker and funnel into the flask
• What is the purpose of inverting the flask several times?

  To ensure a uniform solution
• What must be filled before starting a titration?

  The jet space of the burette
• Why is it important to note the burette reading before and after adding an acid?

  To calculate the volume of acid used
• How should the solution from the burette be added during titration?

  While swirling the mixture and dropwise at the endpoint
• Why should titrations be repeated until at least two concordant results are obtained?

  To identify and discount anomalous titres
• What is done with distilled water during titration?

  It can wash the sides of the conical flask
• Why does adding distilled water not affect the titration results?

  Water does not react or change moles
• Which is more accurate for diluting a solution: a volumetric pipette or a measuring cylinder?

  A volumetric pipette
• What color is phenolphthalein in acid?

  Colorless
• What color is methyl orange in alkali?

  Yellow
• What safety precautions should be taken when handling acids and alkalis?

  Wear eye protection and gloves
• Why should the burette be rinsed with the substance it will contain?

  To prevent dilution or reaction with residues
• What should not be left in the burette during titration?

  The funnel
• Why is a white tile used under the conical flask during titration?

  To help observe the color change
• What color change occurs in a manganate titration?

  Colorless to purple
• What acid is suitable for manganate titration?

  Dilute sulfuric acid
• What happens if insufficient volumes of acid are used in manganate titration?

  MnO2 is produced instead of Mn2+
• Why can't HCl be used in manganate titration?

  Cl- ions are oxidized to Cl2
• Why is nitric acid unsuitable for manganate titration?

  It is an oxidizing agent
• How can uncertainty in measurements be reduced during titration?

  Use pipettes or burettes with lower uncertainty
• How can you reduce uncertainty in a burette?

  Make the titre a larger volume
• What are the steps of preparing a standard solution?

  • When adding a solid, record the difference in mass of the weighing boat
  • Add distilled water to the beaker and stir with a glass rod
  • Pour into a volumetric flask with a funnel
  • Rinse beaker and rod and funnel into volumetric flask
  • Make up the total volume with distilled water
  • Invert flask several times to ensure a UNIFORM SOLUTION