Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5H5N(aq) + H2O (l) C5H5NH+ (aq) + OH- (aq) The pKb of pyridine is 8.75. What is the pH of a 0.180 mol L^-1 solution of pyridine? Express the pH numerically to two decimal places.

Methadone, C21H27ON, is a drug used to treat individuals suffering from opioid addiction.  Methadone is a weak base with pKb=5.60.  Methadone is frequently administered in the form of its hydrochloride salt, methadone hydrochloride (C21H27ONHCl).  Calculate the pH of a 0.200M solution of methadone hydrochloride.[Refer to page 204 in the lecture note manual for a similar problem or watch the Tutorial Video on Moodle for the calculation of the pH of a solution of a drug salt]Report your answer to two decimal places

When carbon dioxide gas dissolves in water, it reacts with the water to form carbonic acid. This is why soft drinks have a low pH, and soda water is often recommended as a mild cleaning agent. It is also why there is concern that rising levels of atmospheric carbon dioxide may cause the Earth's oceans to become more acidic. Here is the reaction between carbon dioxide gas and water: H₂O(1)+ CO₂(g) → H₂CO3(aq) Suppose an engineer decides to study the rate of this reaction. He prepares four reaction vessels with 104.3 g of water and 40.7 g of carbon dioxide gas each. The volume and temperature of each vessel is shown in the table below. Arrange the reaction vessels in decreasing order of initial rate of reaction. In other words, select a "1" next to the vessel in which the engineer can reasonably expect the initial rate of reaction to be highest, a "2" next to the vessel in which the initial rate of reaction would be next highest, and so on. vessel A B с D volume temperature 5.0 L 5.0 L…

Identify the conjugate acid-base pairs:  (a) CH3COOH(aq) + H2O(l) CH3COO2(aq) + H3O1(aq) (b) H2O(l) + F 2(aq) OH2(aq) + HF(aq)

Which of the following is a balanced molecular equation describing the titration of a strong acid with a strong base?  Group of answer choices HI(aq) + NaOH(aq) ⇌ H2O(l) + NaI(aq)  H3O+(aq) + NH4OH(aq) ⇌ H2O(l) + NH4+(aq) H3O+(aq) + OH-(aq) ⇌ 2 H2O(l) HI(aq) + NH4OH(aq) ⇌ H2O(l) + NH4I(aq) HF(aq) + NaOH(aq) ⇌ H2O(l) + NaF(aq)

What is the pH of a grapefruit that contains 0.007 M citric acid solution (C6H8O7)? C6H8O7(aq) + H2O(ℓ) ⇌ C6H7O7−(aq) + H3O+(aq) Ka = 7.5 x 10-4   Round your answer to 2 decimal places.

To prepare a solution of chloroacetic acid (HACL) with pH = 2.87, the solution need only to have a chloroacetic acid concentration of .00258M. Based on this information, what is the Ka for chloroacetic acid? HACl(aq) + H2O(l) <----> H3O+(aq)+ACl-(aq)

Identify the conjugate base of HPO42- in the reaction                  HCO3- (aq)+ HPO42-  (aq)   <-->   H2CO3(aq) + PO43-  (aq)

Identify the reactant that is a Brønsted-Lowry acid and the reactant that is a Brønsted-Lowry base in each of the following: Part C 2- CO3² (aq) + H₂O = HCO3(aq) + OH-(aq) H₂O is the acid (proton donor); CO3² is the base (proton acceptor). H₂O is the acid (proton acceptor); CO² is the base (proton donor). O CO3²- is the acid (proton acceptor); H₂O is the base (proton donor). O CO² is the acid (proton donor); H₂O is the base (proton acceptor). Submit Part B Request Answer H₂SO4 (aq) + H₂O(1)→ H3O+ (aq) + HSO4 (aq) O H₂O is the acid (proton donor); H₂SO4 is the base (proton acceptor). O H₂SO4 is the acid (proton acceptor); H₂O is the base (proton donor). O H₂SO4 is the acid (proton donor); H₂O is the base (proton acceptor). O H₂O is the acid (proton acceptor); H₂SO4 is the base (proton donor). CH3-COO (aq) + H3O+ (aq) = H₂O(1) + CH3-COOH(aq) CH3-COO is the acid (proton acceptor); H3O+ is the base (proton donor). O H3O+ is the acid (proton donor); CH3-COO is the base (proton acceptor). O…

Methylamine (CH3NH2) has Kb = 4.4 x 10–4. What is the pH of 0.15 M aqueous solution of methylamine?           (A) 1.68            (B) 2.09            (C) 11.91          (D) 13.18