Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (a) Write out the reaction that leads to this acidic pH.

문제 86b

Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (b) Using Appendix D, calculate the Ka for pyridinium bromide.

문제 86c

Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (c) A solution of pyridinium bromide has a pH of 2.95. What is the concentration of the pyridinium cation at equilibrium, in units of molarity?

문제 87c

Predict whether aqueous solutions of the following compounds are acidic, basic, or neutral: (c) Na₂CO₃

문제 88a

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (a) AlCl3

문제 88b

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (b) NaBr

문제 88c

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (c) NaClO

문제 88d

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (d) 3CH3NH34NO3

문제 88e

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (e) Na2SO3.

문제 89

Predict which member of each pair produces the more acidic aqueous solution: (a) K+ or Cu2+ (b) Fe2+ or Fe3+ (c) Al3+ or Ga3+.

문제 90

Which member of each pair produces the more acidic aqueous solution: (a) ZnBr₂ or CdCl₂ (b) CuCl or Cu(NO₃)₂ (c) Ca(NO₃)₂ or NiBr₂

문제 91

An unknown salt is either NaF, NaCl, or NaOCl. When 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the pH of the solution is 8.08. What is the identity of the salt?

문제 92

An unknown salt is either KBr, NH4Cl, KCN, or K2CO3. If a 0.100 M solution of the salt is neutral, what is the identity of the salt?

문제 93

Predict the stronger acid in each pair: (a) HNO3 or HNO2 (b) H2SO4 or H2SeO4 (c) CH3COOH or CCl3COOH.

문제 94c

Predict the stronger acid in each pair: (c) HBrO₃ or HBrO₂

문제 94e

Predict the stronger acid in each pair: (e) benzoic acid (C₆H₅COOH) or phenol (C₆H₅OH).

문제 95b

Based on their compositions and structures and on conjugate acid–base relationships, select the stronger base in each of the following pairs: (b) BrO^- or BrO₂^-

문제 96b

Based on their compositions and structures and on conjugate acid–base relationships, select the stronger base in each of the following pairs: (b) PO43- or AsO43-

문제 97c

Indicate whether each of the following statements is true or false. For each statement that is false, correct the statement to make it true. (a) In general, the acidity of binary acids increases from left to right in a given row of the periodic table. (b) In a series of acids that have the same central atom, acid strength increases with the number of hydrogen atoms bonded to the central atom. (c) Hydrotelluric acid 1H2Te2 is a stronger acid than H2S because Te is more electronegative than S.

문제 98

Indicate whether each of the following statements is true or false. For each statement that is false, correct the statement to make it true. (a) Acid strength in a series of H¬A molecules increases with increasing size of A. (b) For acids of the same general structure but differing electronegativities of the central atoms, acid strength decreases with increasing electronegativity of the central atom. (c) The strongest acid known is HF because fluorine is the most electronegative element.

문제 99c

Indicate whether each of the following statements is correct or incorrect. (c) Conjugate acids of weak bases produce more acidic solutions than conjugate acids of strong bases.

문제 99d

Indicate whether each of the following statements is correct or incorrect. (d) K⁺ ion is acidic in water because it causes hydrating water molecules to become more acidic.

문제 100

A solution is made by adding 0.300 g Ca1OH221s2, 50.0 mL of 1.40 M HNO3, and enough water to make a final volume of 75.0 mL. Assuming that all of the solid dissolves, what is the pH of the final solution?