Waec Model Questions Vol1 2024 Chemistry Question 8

Practice essay / theory question 8 from the 2024 Waec Model Questions Vol1 Chemistry examination. This question covers solubility, solubility_product, common_ion_effect, temperature_effect .

Waec Model Questions Vol1 2024 Chemistry Essay / Theory
Topics: solubility solubility_product common_ion_effect temperature_effect
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

A solubility experiment for silver chloride (AgCl) was carried out as follows: - 250 mL of distilled water was placed in a beaker (labelled A) and the beaker was positioned on a water‑bath (labelled B) set to maintain a temperature of 60 °C. The density of water at this temperature is 0.983 g mL⁻¹. - A thermometer (C) was inserted into the beaker to monitor the temperature. - Excess solid AgCl (2.00 g) was added to the water and the mixture was stirred with a glass rod (D) until no further dissolution was observed. - The suspension was filtered using a filter funnel (E) fitted with filter paper (F). The filtrate was collected in a clean container. - The undissolved solid retained on the filter paper was transferred to a pre‑weighed weighing dish (G) and dried. The mass of the dried solid was recorded as 0.500 g on an analytical balance (H). - After filtration, the volume of the clear saturated solution was measured as 240 mL. The diagram of the apparatus is provided. Using the information above, answer the following questions:

Question Parts

( a )
Calculate the solubility of AgCl at 60 °C in mol L⁻¹. Show all steps, including how you determine the amount of AgCl that actually dissolved.
( b )
Using the solubility obtained in part (a), calculate the solubility‑product constant (Ksp) of AgCl at 60 °C. State any assumptions made.
( c )
If the temperature is raised to 80 °C and the solubility of AgCl is found to increase by 20 % relative to that at 60 °C, calculate the new Ksp at 80 °C. Then discuss qualitatively how temperature influences the solubility product of this salt.
( d )
Explain how the addition of 0.10 mol L⁻¹ NaCl to the saturated AgCl solution at 60 °C would affect its solubility. Include the common‑ion effect in your discussion and give the new equilibrium concentration of Ag⁺ ions.

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About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 8. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

The question covers solubility, solubility_product, common_ion_effect, temperature_effect .

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