CH102 Lab 10 PostLab - Acid-Base Studies

What is the pH of 0.075 M HCl? What is the hydronium ion concentration in a solution with pH = 2.47? Write net Brønsted equations that show the acidic or basic nature of the following solutions in water. For polyprotic species (vitamin C, lemon juice, and washing soda), show only one proton transfer. Remember that spectator ions are not included. (Use the lowest possible coefficients. Omit states-of-matter in your answer.) (a) vinegar (acetic acid, HC2H3O2) HC2H3O2 + H2O → C2H3O2 - + H3O+ HC2H3O2 + H2O → C2H3O2 - + H3O+ HC_2H_3O_2 + H_2O --> C_2H_3O_2^- + H_3O^+ (b) bleach (sodium hypochlorite, NaOCl) OCl- + H2O → OH- + HClO H2O + ClO- → OH- + HClO or H2O + OCl- ⇌ OH- + HClO OCl^- + H_2O --> OH^- + HClO (c) ammonia (NH3) NH3 + H2O → OH- + NH4 + H2O + NH3 → OH- + NH4 + NH_3 + H_2O --> OH^- + NH_4^+ (d) Vitamin C (ascorbic acid, H2C6H6O6) H2C6H6O6 + H2O → HC6H6O6 - + H3O+ H2C6H6O6 + H2O → HC6H6O6 - + H3O+ H_2C_6H_6O_6 + H_2O --> HC_6H_6O_6^- + H_3O^+ (e) lemon juice (citric acid, H3C6H5O7) H3C6H5O7 + H2O → H2C6H5O7 - + H3O+ H3C6H5O7 + H2O → H2C6H5O7 - + H3O+ H_3C_6H_5O_7 + H_2O --> H_2C_6H_5O_7^- + H_3O^+ (f) washing soda (sodium carbonate, Na2CO3) CO 2- 3 + H2O → OH- + HCO3 - H2O + CO3 2- → OH- + HCO3 - CO_3^2- + H_2O --> OH^- + HCO_3^-