What is the pH of a 0.450 M solution of the cyanate ion, OCN–? Show the simplifying assumption that is needed to find the pH? OCN–(aq)  +  H2O(l)       HOCN(aq)  +  OH–(aq)           Kb  =  2.8 × 10–11

Calculate the pH of a 3.0 × 10-4M  HCl (aq) solution

Determine the pH of the molecules given in a 1L beaker containing 0.035M solution of the given molecule:  NaNO2,  C6H5CHCOOH, Ba(OH)2. (C6H5CHCOOH, Ka=6.3 x 10^-5, HNO2 Ka= 4.5 x 10^-4, CH3NH2, Kb= 5.0 x 10^-4).

A solution is prepared at 25 °C that is initially 0.14 M in chlorous acid (HC10,), a weak acid with K,=1.1 × 10 , and 0.17 M in potassium chlorite (KC10,). Calculate the pH of the solution. Round your answer to 2 decimal places. pH =

(a) What is the pH of 0.75 M NaF?(b) What is the pH of 0.88 M pyridinium chloride, C₅H₅NHCl?

Calculate the pH of the resulting solution if 29.0 mL of 0.290 M HCI(aq) is added to 39.0 mL of 0.290 M NAOH(aq). pH = Calculate the pH of the resulting solution if 29.0 mL of 0.290 M HCI(aq) is added to 19.0 mL of 0.390 M NAOH(aq). pH =

Given that Ka’s for hydrofluoric acid (HF) and boric acid (H3BO3) are 6.3 × 10^–4and 5.4 × 10^–10, respectively, calculate the pH of the following solutions: (a)The mixture from adding 50 mL 0.2 M HF to 50 mL 0.5 M sodium borate (NaH2BO3).  (b)The mixture from adding an additional 150 mL 0.2 M HF to the solution in (a), i.e., a total of 200 mL 0.2 M HF was added to 50 mL 0.5 M NaH2BO3.

Boric acid, BOH is used as a mild antiseptic. What is the pH of a 0.025 aqueous solution of boric acid? What is the degree of ionisation of boric acid in this solution? The hydrogen ion arises principally from the reaction: B(OH),(aq) + H,O(1) — В(ОН), (аq) + н* (aq) The equilibrium constant for this reaction is 5.9 x 10-10.

What is the pH of a solution prepared by dissolving 0.24 gram of solid MgO in enough water to make 250 mL of aqueous Mg(OH)2 ? (MW of MgO = 40.30 g/mol)             MgO(s) + H2O(l) → Mg2+(aq) + 2 OH-(aq)

The base protonation constant K, of allantoin (C,H¸N,O,NH,) is 9.12 x 10 °. 4 3 Calculate the pH of a 0.46 M solution of allantoin at 25 °C. Round your answer to 1 decimal place. pH = || %D