What is the pH of a buffer solution that is 0.20 M methyl amine, CH3NH2 and 0.18 M methylammonium chloride CH3NH2Cl? The Kb for CH3NH2 is 4.4x10-4. You do not need to solve the quadratic equation for this problem. Express your answer to two decimal places.

Determine the pH of a 0.275 M KOH solution. Give your answer to 2 decimal places in regular notation.   Determine the pH of a 0.150 M aniline solution (Kb = 4.3x10-10). Give your answer to 2 decimal place in regular notation.   Determine the pH of a 0.175 M Phenol solution (Ka = 1.3x10-10). Give your answer to 2 decimal place in regular notation.

Calculate the pH of a mixture containing 0.23 M HONH2 and 0.44 M HONH3Cl. (Kb = 1.1 × 10–8) What information do we need to calculate the pH? (Choose all letters that apply.) a. 0.23 M HONH2b. 0.44 M HONH3Clc. the major species in the solutiond. pOH = –log[OH–] and 14.00 = pOH + pHe. Kb = 1.1 × 10–8

2) a) Eggshells, CaCO3, are not very soluble but they will dissolve to a small degree. Predict if solution of crushed eggshells will be acidic, basic, or neutral. Write any hydrolysis reactions that apply and use the appropriate K, and K, values to explain your prediction. Are eggshells, CaCO₂, solution = b) Potassium hydrogen phthalate, KHC,H4O4, also known as KHP, is an acidic salt. It is often used as a primary standard in acid-base titrations. It is a solid that is not hygroscopic, making it easy to weigh accurately. Write the dissociation reaction of KHC₂H₂O₂. It dissociates into ONE cation and ONE anion: HC H₂O4 is an amphoteric anion. Write the K, hydrolysis reaction for HC H₂O4™- Write the K, hydrolysis reaction for HC₂H₂O. (acidic, basic or neutral) Which is greater in value, the K, for HC₂H4O; or the K₂ for HC₂H₂O₂ ? How did you make your determination?