Ijmb Model Questions Vol1 2023 Chemistry Question 4

Practice practical question 4 from the 2023 Ijmb Model Questions Vol1 Chemistry examination. This question covers Mole Concept, Stoichiometry, Acid‑Base Titration .

Ijmb Model Questions Vol1 2023 Chemistry Practical
Topics: Mole Concept Stoichiometry Acid‑Base Titration
Question 4 IJMB_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • practical

A sample of an unknown solid Y weighing 0.240 g is dissolved in excess distilled water. The solution is titrated with 0.2000 M hydrochloric acid (HCl) using phenolphthalein as the indicator. The colour changes from pink to colourless at the endpoint after 24.50 mL of the acid has been added. The reaction between Y and HCl is known to be: Y + 2 HCl → YCl₂ + H₂↑ where each molecule of Y contains one replaceable –OH group. Answer the following questions.

Question Parts

( a )
Calculate the number of moles of HCl that were required to reach the endpoint.
( b )
Determine the number of moles of Y present in the weighed sample.
( c )
Calculate the experimental molar mass of Y using the mass of the sample and the moles obtained.
( d )
The theoretical molar mass of pure Y is 98.0 g mol⁻¹. Calculate the percent purity of the sample.
( e )
Discuss two possible sources of error that could affect the accuracy of the purity determination.

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About This Question

This is Ijmb Model Questions Vol1 2023 Chemistry Question 4. It is one of the practical questions from the 2023 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Mole Concept, Stoichiometry, Acid‑Base Titration .

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