Chemistry homework questions

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.)

(a)    pH = 5.16   (b)    pH = 5.53   (c)    pH = 4.74   (d)    pH = 4.93  

Consider the titration of 41.5 mL of 0.198 M HCl with 0.124 M NaOH. Calculate the pH of the resulting solution after the following volumes of NaOH have been added. (Assume that all solutions are at 25°C.)

(a)    0.0 mL   (b)    10.0 mL    (c)    40.0 mL   (d)    80.0 mL   (e)    100.0 mL  

The concentration of Ba2+ in a solution saturated with BaF2(s) is 1.82 ✕ 10−2 M. Calculate Ksp for BaF2.