1. Solution consists of water and weak acid HA at room temperature. a. if the pH is 3.25 and initial concentration of HA is 0.200M what is value of Ka?
CHEM102 Exam III (May 18, 2017). 50 points/ problem (max. 200 points). Remember to justify your answers. 1. Solution consists of water and weak acid HA at room temperature. a) If the pÅl is 3,25 and the initial concentration of HA is 0.200 M, what is the value of Ka? b) Given the solution in a), what is the percent ionization? c) If the initial concentration of HA is 1.0 M, what is the pH and pOH? 2. Consider titration of 100. mL of 0.25 M hydrazoic acid (HNs; Ka 2.5 Ã 10-5) by 1.0 M NaOH solution a) What is the initial pH? b) What is the equivalence point and pÅHI at this point? c) How would you choose your indicator for this titration? 3. The following reactions are known: () aHut) 12)0-(o) -, sC02(0) + 54T1 kJ/mol H' =-283 kJ/mol What is the value of AHo for the following combustion reaction? (3) C,H18(I) + 8402(g) â 8C0(g) + 9H20(1) 4. Show that given ÎG 0 (i.e., spontaneous process)
