For the titration of 15.0 mL of 0.400 M HCl with 0.200 M NaOH. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) a) What is the initial pH? pH =  b) What is the pH after the addition of 5.00 mL of NaOH ? pH =  c) What is the pH after the addition of 30.0 mL of NaOH? pH =  d) What is the pH after the addition of 35.0 mL of NaOH? pH = 

Calculate the pH of a solution that contains 3.9 × 10-5 M H3O+ at 25°C.

Calculate the hydroxide ion concentration in an aqueous solution with a pH of 3.00 at 25°C.

Are the following solutions acidic, basic, or neutral? a) Ba(NO3)2(aq) b) NaClO2(aq) c) NH4ClO4(aq)

The pH of a 1.75 M solution of weak acid HA is 3.25. Calculate the value of Ka for HA.

At 298 K , ∆H = 520.0 kJ and ∆S = 184 J/K for the reaction shown below. MnO2(s)  ⟶ Mn(s) + O2(g) (a) Use the data to decide if this reaction is spontaneous at 298 K. (b) What is the temperature above which the reaction is spontaneous?

Which of the following is true when ∆G = 0?

A reaction mixture contains 0.139 M I2, 0.0392 M Cl2, and 0.222 M ICl for the reaction shown below: I2(g) + Cl2(g) ⇌ 2ICl(g)              KC = 9.04 at 298 K Show all your work and setup for credit. A) Calculate QC for the reaction. B) Is the reaction at equilibrium? C) If the reaction is not at equilibrium, will it proceed to form more reactants or more product?

Calculate ΔG°rxn for the following reaction at 525 K. CH2O(g) +  2H2(g) → CH4(g)   +  H2O(g) ΔH° = -94.9 kJ;  ΔS° = -224.2 J/K Answer: ΔG°rxn  = kJ

For the reaction 2A + B + C → D + 2F, the rate law is: rate = k2-1 Which of the following statements is false?