QCEVault

Chemical equilibrium — Question 86

Original QCE Vault practice · 7 marks

Q86 · Practice questionComplex unfamiliar7 marks

QUESTION 86 (7 marks)

A saturated solution of Mg(OH)2 is filtered to remove all undissolved solid. At 25∘C, Ksp=1.8×10−11 and Kw=1.0×10−14. Assume dissolution is the only significant source of hydroxide.

a) Calculate the molar solubility. [2 marks]

b) Calculate the pH. [2 marks]

c) Calculate the volume of 0.00500 mol L⁻¹ HCl needed to neutralise all hydroxide in 20.0 mL of the filtered solution. [3 marks]

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