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U-14
4.
a)
Extrapolating from your knowledge of the other halogens, what is likely to be the molecular formula for
astatine? Explain. (0.2 marks)
b)
Is astatine likely a gas, liquid or solid at room temperature? Explain. (0.2 marks)
Part III:
Structure and Extent of Ionization
1.
a)
Order the solutions of the chloroacetic acid series in increasing value of pH. (0.1 marks)
b)
For each acid studied, calculate the weak acid dissociation constant using the measured pH.
NOTE: Include detailed calculations. (2.2 marks)
