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5 Acid and Base Titrations SAQ2

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Questions and Answers

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

To ensure that all solute is fully dissolved and reacted with the acid, preventing any loss of reactant and ensuring accurate results.

What chemical is titrated against vinegar?

NaOH

Why is it necessary to dilute the bottled vinegar in Experiment 3, and what would happen if it were not diluted?

It is necessary to dilute the bottled vinegar to prevent a large percentage error, as an undiluted vinegar would result in a colour change after a very small volume of acid was added.

What is the purpose of inverting the volumetric flask 10 times in Experiment 1, and what does it achieve?

Inverting the flask 10 times fully mixes the solution, ensuring that the solute is uniformly distributed and the solution is homogeneous. Signup and view all the answers

What is the colour change observed in the Vinegar titration?

Pink to colourless Signup and view all the answers

What is a standard solution in acid and base titrations?

A solution whose concentration is accurately known. Signup and view all the answers

What is a primary standard in acid and base titrations?

A water-soluble substance that is stable and available in pure form. Signup and view all the answers

What is the purpose of washing a burette with DI water and then with the solution it is to contain?

To prevent contamination and ensure the accuracy of the titration. Signup and view all the answers

Why is the pipette filled until the bottom of the meniscus rests on the graduation mark when viewed from eye level?

To ensure accurate measurement of the solution. 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 a white tile placed under the conical flask?

To provide a contrasting background for observing the color change of the indicator. Signup and view all the answers