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Acid and Base Titrations MCQ1

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Questions and Answers

What is the primary characteristic of a standard solution in acid and base titrations?

It is a solution whose concentration is accurately known (correct)

It is a solution that is stable and available in pure form

It is a solution that is insoluble in water

It is a solution that is highly reactive

Which of the following is an example of a primary standard?

Ammonia (NH3)

Sodium hydroxide (NaOH)

Anhydrous sodium carbonate (Na2CO3) (correct)

Hydrochloric acid (HCl)

What is the purpose of washing the burette with DI water before use?

To add the solution to the burette

To calibrate the burette

To remove any impurities from the burette (correct)

To ensure the burette is dry

How is the burette filled with the solution?

Using a funnel Signup and view all the answers

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 Signup and view all the answers

How is the meniscus viewed in the pipette during the filling process?

By viewing from eye level Signup and view all the answers

What is the purpose of adding a few drops of indicator to the conical flask?

To indicate the endpoint of the titration Signup and view all the answers

Why is the tip of the pipette placed against the inside of the conical flask for about 3 seconds?

To remove the drop adhering to the tip of the pipette Signup and view all the answers

What is the purpose of using a white tile under the conical flask?

To view the color change of the solution during the titration Signup and view all the answers

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 Signup and view all the answers

What is the reason for diluting the bottled vinegar in the titration experiment?

To prevent a large percentage error Signup and view all the answers

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 Signup and view all the answers

What is the indicator used in the titration experiment between HCl and sodium carbonate?

Methyl Orange Signup and view all the answers

What is the formula to convert mol/L to g/L in the vinegar titration calculation?

Molarity x Molecular Weight Signup and view all the answers

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 Signup and view all the answers

What is the term used to describe the property of H2SO4 that allows it to absorb water vapour from the air?

Hydroscopic Signup and view all the answers

What is the formula to calculate the percentage by weight of a substance in a solution?

Percentage = (Mass / Volume) x 100 Signup and view all the answers