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Acid and Base Titrations: MCQ2

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Questions and Answers

What is the purpose of washing the sides of the conical flask during the titration process?

To mix the solution thoroughly
To remove excess solute from the flask
To ensure accurate measurement of the solution (correct)
To prevent contamination of the solution

What is the purpose of using a stirring rod in step 3 of making a standard solution of anhydrous Na2CO3?

To ensure all the solute is dissolved (correct)
To mix the solution thoroughly
To remove excess water from the solution
To dissolve the solute faster

What is the characteristic of HNO3?

It is hydroscopic and non-volatile
It is volatile and hydroscopic (correct)
It is volatile and non-hydroscopic
It is non-volatile and non-hydroscopic

What is the purpose of adding DI water to the volumetric flask using a dropper in the making of a standard solution of anhydrous Na2CO3?

To ensure the meniscus rests on the graduation mark (A) Signup and view all the answers

What is the colour change observed when using Methyl Orange as an indicator in Exp 2?

Yellow to Peach Pink (A) Signup and view all the answers

Why is the bottled vinegar usually diluted?

To ensure accurate measurement of the acid (D) Signup and view all the answers

What is the purpose of taking into account the dilution factor in step 2 of solving vinegar titration questions?

To calculate the concentration of the original vinegar (A) Signup and view all the answers

What is the term for the amount of water absorbed by a substance from the air?

Hydroscopic (C) Signup and view all the answers

What is a characteristic of a primary standard?

It is a water-soluble substance that is stable and available in pure form (D) Signup and view all the answers

Why is the burette washed out with the solution it is to contain?

To prevent contamination (D) Signup and view all the answers

What is the purpose of opening the tap of the burette briefly?

To fill the part of the burette below the tap (B) Signup and view all the answers

Why is the pipette filled until the bottom of the meniscus rests on the graduation mark?

To measure the exact volume of the solution (D) Signup and view all the answers

What is the purpose of placing the tip of the pipette against the inside of the conical flask for about 3 seconds?

To allow the pipette to drain completely (D) Signup and view all the answers

Why is the conical flask washed out with DI water only?

To prevent contamination with the solution (B) 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 (A) Signup and view all the answers

Why is a white tile placed under the conical flask?

To reflect the color of the indicator (B) Signup and view all the answers