POST UTME UNILORIN 2021 Chemistry | Objective
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Question 1
Determine the pH of a 0.1 M solution of HCl in water at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is described by the equation \log(K) = -0.5\( 1/T - 1/298K \) where K is in units of M.
Question 2
A 2.5 g sample of a hydrocarbon is burned in a bomb calorimeter at 25°C, producing a temperature increase of 2.5°C. If the heat capacity of the calorimeter is 1.5 kJ/°C, what is the heat of combustion of the hydrocarbon, in kJ/g?
Question 3
A 1.0 g sample of a hydrocarbon is burned in a bomb calorimeter at 25°C, producing a temperature increase of 2.5°C. If the heat capacity of the calorimeter is 1.5 kJ/°C, what is the heat of combustion of the hydrocarbon, in kJ/g?
Question 4
A 25 mL sample of a 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
Question 5
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
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