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- For conjugate acidbase pairs, how are Ka and Kb related? Consider the reaction of acetic acid in water CH3CO2H(aq)+H2O(l)CH3CO2(aq)+H3O+(aq) where Ka = 1.8 105 a. Which two bases are competing for the proton? b. Which is the stronger base? c. In light of your answer to part b. why do we classify the acetate ion (CH3CO2) as a weak base? Use an appropriate reaction to justify your answer. In general, as base strength increases, conjugate acid strength decreases. Explain why the conjugate acid of the weak base NH3 is a weak acid. To summarize, the conjugate base of a weak acid is a weak base and the conjugate acid of a weak base is a weak acid (weak gives you weak). Assuming Ka for a monoprotic strong acid is 1 106, calculate Kb for the conjugate base of this strong acid. Why do conjugate bases of strong acids have no basic properties in water? List the conjugate bases of the six common strong acids. To tie it all together, some instructors have students think of Li+, K+, Rb+, Cs+, Ca2+, Sr2+, and Ba2+ as the conjugate acids of the strong bases LiOH, KOH. RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2. Although not technically correct, the conjugate acid strength of these cations is similar to the conjugate base strength of the strong acids. That is, these cations have no acidic properties in water; similarly, the conjugate bases of strong acids have no basic properties (strong gives you worthless). Fill in the blanks with the correct response. The conjugate base of a weak acid is a_____base. The conjugate acid of a weak base is a_____acid. The conjugate base of a strong acid is a_____base. The conjugate acid of a strong base is a_____ acid. (Hint: Weak gives you weak and strong gives you worthless.)The Ka of a weak acid is 3.33 x 10-5, what is the pKb of it's conjugate base?A weak base has a Kü of 5.6x10¹4, determine the pK, of the base. O 10.75 O 7.64 O 3.25 O 6.36
- Consider two acids: HCO2H (formic acid, pKa = 3.8) and pivalic acid [(CH3)3CCO,H, pK = 5.0]. (a) Which acid has the larger K? (b) Which acid is the stronger acid? (c) Which acid forms the stronger conjugate base? (d) When each acid is dissolved in water, for which acid does the equilibrium lie further to the right? %3D The pKa values in Table 2.1 span a large range (-7 to 50). The pK, scale is logarithmic. small difference in pK, translates into a large numerical difference, For example, the diffe between the pK, of NH3 (38) and CH2=CH, (44) is six pKa units. This means that NH, is one million times more acidic than CH,=CH,.In the laboratory, a general chemistry student measured the pH of a 0.527 M aqueous solution of methylamine, CH3NH₂ to be 12.159. Use the information she obtained to determine the Kb for this base. Kb (experiment) = Show Transcribed Text In the laboratory, a general chemistry student measured the pH of a 0.524 M aqueous solution of pyridine, C,HSN to be 9.461. Use the information she obtained to determine the K, for this base. Kb (experiment) =A 0.050 M solution of sodium meta-toluate (NaTol) has a pH of 8.47. What is the Kb of meta-toluate ion? What is the Ka of meta-toluic acid(HTol)?
- According to the table in the text, hydrogen fluoride (HF) has a pK, of 3.2. If a solution of HF is brought to a pH of 5.0, what will be true of the relative concentrations of HF and fluoride ion (F) in that solution? The fluoride ion concentration will be zero O Both fluoride ion and HF will be present, but the concentration of HF will be greater than that of fluoride ion The concentration of the fluoride ion will be greater than that of HF O The concentration of the fluoride ion will be the same as that of HFA base is found to have a Kb = 6.38 at 25 °C. What is the pKa (to two decimal places) of the conjugate acid?The value of K for acetylsalicylic acid (aspirin) is 3.00x104. What is the value of Kp, for its conjugate base, CH,04? An error has been detected in your answer. Check for typos, miscalculations etc. before submitting your answer.
