17 Questions
What is the primary characteristic of a standard solution in acid and base titrations?
It is a solution whose concentration is accurately known
Which of the following is an example of a primary standard?
Anhydrous sodium carbonate (Na2CO3)
What is the purpose of washing the burette with DI water before use?
To remove any impurities from the burette
How is the burette filled with the solution?
Using a funnel
What is the purpose of briefly opening the tap of the burette during the filling process?
To fill the part of the burette below the tap
How is the meniscus aligned in the pipette during the filling process?
By viewing from eye level
What is the purpose of adding a few drops of indicator to the conical flask?
To indicate the endpoint of the titration
Why is the tip of the pipette placed against the inside of the conical flask for about 3 seconds?
To allow the pipette to hold a small amount of the liquid after delivery
What is the purpose of using a white tile under the conical flask?
To view the color change of the solution during the titration
What is the purpose of rinsing the beaker and adding washings during the preparation of a standard solution of anhydrous Na2CO3?
To prevent loss of the solute during transfer
What is the reason for diluting the bottled vinegar in the titration experiment?
To prevent a large percentage error
What is the purpose of using a dropper to add DI water to the volumetric flask during the preparation of a standard solution of anhydrous Na2CO3?
To ensure accurate measurement of the volume
What is the indicator used in the titration experiment between HCl and sodium carbonate?
Methyl Orange
What is the formula to convert mol/L to g/L in the vinegar titration calculation?
Molarity x Molecular Weight
What is the purpose of inverting the volumetric flask 10 times during the preparation of a standard solution of anhydrous Na2CO3?
To mix the solution thoroughly
What is the term used to describe the property of H2SO4 that allows it to absorb water vapour from the air?
Hydroscopic
What is the formula to calculate the percentage by weight of a substance in a solution?
Percentage = (Mass / Volume) x 100
Learn about the importance of standard solutions in acid and base titrations, including the characteristics of primary standards and the procedures to ensure accurate titrations. Test your knowledge on the preparation and use of burettes in titration experiments.
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