Waec Model Questions Vol1 2021 Chemistry Question 8

Practice essay / theory question 8 from the 2021 Waec Model Questions Vol1 Chemistry examination. This question covers Solubility .

Waec Model Questions Vol1 2021 Chemistry Essay / Theory

Topic: Solubility

Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

A saturated solution of lead(II) chloride (PbCl₂) at 25 °C is prepared. The solubility product constant at this temperature is Ksp = 1.6 × 10⁻⁵. In addition, lead(II) forms the complex ion [PbCl₄]²⁻ with a formation constant Kf = 1.0 × 10⁵.

Question Parts

( a )

Calculate the molar solubility of PbCl₂ in pure water at 25 °C.

( b )

If 0.10 mol of NaCl is added to 1.00 L of the saturated solution, determine the new molar solubility of PbCl₂ (ignore complex formation).

( c )

Taking the complex formation of [PbCl₄]²⁻ into account, calculate the total molar solubility of lead(II) in the 0.10 M NaCl solution.

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About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 8. It is one of the essay questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

The question covers Solubility .

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