Chemistry Sample Preparation and Determination Quiz

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What is the purpose of adding pulverised sodium chloride to the sample?

To help in the extraction process (correct)

To neutralize the sample

To precipitate certain compounds

To increase the density of the solution

Why is it important to avoid the formation of emulsion during extraction?

Emulsion hinders the extraction process

Emulsion makes the solution difficult to filter

Emulsion leads to inaccurate determination (correct)

Emulsion causes loss of sample

After washing the chloroform extract free from mineral acid, what should be done next?

Heat the mixture to remove excess water

Dry the chloroform layer over anhydrous sodium sulphate (correct)

Discard the chloroform extract

Add more mineral acid

What should be done after draining off the water phase from the chloroform extract?

Dry the chloroform layer over anhydrous sodium sulphate Signup and view all the answers

What is the purpose of extracting with multiple portions of chloroform?

To ensure complete extraction of compounds Signup and view all the answers

Why is it important to let the sample stand for 2 hours before filtering?

To allow time for precipitation to occur Signup and view all the answers

What is the purpose of neutralizing to litmus paper using hydrochloric acid during determination?

To adjust the pH of the solution Signup and view all the answers

What is the primary issue with the text provided?

The text contains a lot of irrelevant repetition. Signup and view all the answers

Why is it important to avoid repetitive content in writing?

To keep readers engaged and interested. Signup and view all the answers

What effect does excessive repetition have on the readability of a text?

It makes the text monotonous and tiresome to read. Signup and view all the answers

Which aspect of writing is negatively impacted by repeated content?

Clarity and conciseness Signup and view all the answers

How can writers improve the quality of their writing in light of the text's issue?

By introducing new and relevant information. Signup and view all the answers

What is the purpose of washing the chloroform extract free from mineral acid?

To remove impurities that may interfere with subsequent steps Signup and view all the answers

Why is it important to let the sample stand for 2 hours before filtering?

To allow any remaining water to evaporate Signup and view all the answers

What happens if an emulsion forms during extraction?

It may lead to loss of product and reduced efficiency Signup and view all the answers

Why is it necessary to extract with multiple portions of chloroform?

To ensure complete extraction of the compound from the sample Signup and view all the answers

What is the purpose of adding pulverized sodium chloride to the sample?

To decrease solubility of impurities Signup and view all the answers

Chemistry Sample Preparation and Determination Quiz

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Questions and Answers

What is the purpose of adding pulverised sodium chloride to the sample?

Why is it important to avoid the formation of emulsion during extraction?

After washing the chloroform extract free from mineral acid, what should be done next?

What should be done after draining off the water phase from the chloroform extract?

What is the purpose of extracting with multiple portions of chloroform?

Why is it important to let the sample stand for 2 hours before filtering?

What is the purpose of neutralizing to litmus paper using hydrochloric acid during determination?

What is the primary issue with the text provided?

Why is it important to avoid repetitive content in writing?

What effect does excessive repetition have on the readability of a text?

Which aspect of writing is negatively impacted by repeated content?

How can writers improve the quality of their writing in light of the text's issue?

What is the purpose of washing the chloroform extract free from mineral acid?

Why is it important to let the sample stand for 2 hours before filtering?

What happens if an emulsion forms during extraction?

Why is it necessary to extract with multiple portions of chloroform?

What is the purpose of adding pulverized sodium chloride to the sample?

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