Neco 2024 Chemistry Question 8

Practice essay / theory question 8 from the 2024 Neco Chemistry examination. This question covers solubility_product .

Neco 2024 Chemistry Essay / Theory

Topic: solubility_product

Question 8 NECO • 2024 • CHEMISTRY • essay

A student carried out a gravimetric determination of the solubility product (Ksp) of lead(II) chloride (PbCl2) at 25 °C using the laboratory apparatus shown.

Question Parts

( a )

Write the net ionic equation for the dissolution of PbCl2 in water.

( b )

The student filtered 250.0 mL of the saturated solution and obtained 0.452 g of dried PbCl2 precipitate. Calculate the molar solubility (mol L⁻¹) of PbCl2 at 25 °C.

( c )

Using the molar solubility obtained in part (b), calculate the Ksp of PbCl2 at 25 °C. Show all steps.

( d )

The student suspects that the temperature of the water bath may have risen to 30 °C during the experiment, which would increase solubility. Explain qualitatively how the Ksp value would be affected and why, referring to Le Chatelier’s principle.

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About This Question

This is Neco 2024 Chemistry Question 8. It is one of the essay questions from the 2024 Neco Chemistry examination.

The question covers solubility_product .

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