Q36 · Practice questionSimple familiar4 marks
QUESTION 36 (4 marks)
At , the solubility product of is .
a) Write its dissolution equation and solubility-product expression. [2 marks]
b) Calculate its molar solubility in pure water. [2 marks]
WORKED SOLUTION
4 marksPractice marking scheme
; ; .
If , then . Therefore .
- Writes balanced dissolution equation with states. [1 marks]
- Writes correct Ksp expression. [1 marks]
- Uses Ksp = 4s³. [1 marks]
- Calculates s = 2.0 × 10⁻⁴ mol L⁻¹. [1 marks]
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