Titration practical

• What is a titration used for in chemistry?

  To determine the concentration of an unknown solution
• What is the known concentration of the sodium hydroxide solution used in the titration?

  0.1 mol per decimeter cubed
• What is the approximate concentration of the sulfuric acid solution?

  0.05 mol per decimeter cubed
• What piece of equipment is used to measure an exact volume of solution in a titration?

  A pipette
• What type of pipette is used to measure exactly 25 centimeters cubed of solution?

  A bulb pipette
• Why can't we suck the solution into the pipette using our mouths?

  Health and safety regulations prohibit it
• How do we attach the safety filler to the pipette?

  By holding the top and twisting it on
• What is the purpose of the meniscus in the pipette?

  To indicate the exact liquid level
• How do you ensure the sodium hydroxide level is exactly on the line?

  By adjusting the level to eye level
• What should you do with the last drops of sodium hydroxide in the pipette?

  Let them drip out
• What is the function of a burette in a titration?

  To measure and dispense variable volumes
• How do you fill the burette with sulfuric acid?

  Using a funnel from the top
• Why should the burette be filled below eye level?

  To avoid spilling acid in your face
• What is the first step after filling the burette?

  Ensure the tap is closed
• What color does sodium hydroxide turn with methyl orange indicator?

  Yellow
• What indicates the endpoint of the titration?

  A permanent color change
• How do you know when to stop adding sulfuric acid during titration?

  When a permanent pink color appears
• What is the significance of performing a rough titration first?

  To estimate the volume needed for neutralization
• What should you do after the rough titration?

  Perform accurate titrations with dropwise addition
• What is the purpose of adding an indicator during titration?

  To show the endpoint of the reaction
• How do you calculate the number of moles of sodium hydroxide?

  Using the formula: moles = concentration × volume
• What is the volume of sodium hydroxide used in the titration?

  25 centimeters cubed
• How do you convert volume from centimeters cubed to decimeters cubed?

  By dividing by 1000
• What is the balanced equation for the reaction between sodium hydroxide and sulfuric acid?

  2 NaOH + H2SO4 → Na2SO4 + 2 H2O
• What is the mole ratio between sodium hydroxide and sulfuric acid?

  2:1
• How do you find the concentration of sulfuric acid after titration?

  Using moles and volume of sulfuric acid
• What was the final calculated concentration of sulfuric acid?

  0.095 mol per decimeter cubed
• How does the final concentration compare to the initial estimate?

  It is nearly twice as strong
• What is the procedure of titration?

  It involves measuring and mixing solutions to find concentrations.
• Why is it important to use safety fillers?

  To prevent accidental ingestion of hazardous solutions.
• What risks are associated with using pipettes?

  They can break and cause injury.
• Why is a white tile used during titration?

  To better observe color changes in the solution.
• What is the role of different indicators in titrations?

  To signal the endpoint of the reaction.
• Why is it important to repeat titrations for accuracy?

  To ensure consistent and reliable results.
• How do you ensure the burette is filled correctly?

  By checking the tap is closed before filling.
• Why is measuring from the bottom of the meniscus important?

  It ensures accurate volume readings.
• What is the importance of balancing chemical equations in titrations?

  To determine the correct mole ratios for calculations.
• How do you convert volume units for calculations?

  By converting centimeters cubed to decimeters cubed.
• What is the purpose of a titration in chemistry?

  To determine concentrations of unknown solutions
• How does a titration work?

  It uses known solutions to react with unknowns