
A weak base (B) has a pKb value of 6.84.
a) At what pH is [BH ] = [B]?
b) What is the predominant species of B at pH 5.37?
c) What is the predominant species of B at pH 9.31?
For the weak base B, pKb = 4.83. Give the value of pKa for the conjugate acid BH+. At what pH does [B]=[BH+]? What is the ratio [B]/[BH+] at pH=7.05? What is the ratio [B]/[BH+] at pH=12.23?
The pKvalues for the dibasic base B are pKb = 2.10 and pKb2 = 7.77. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq). What is the pH before addition of any HCI? pH = 6.06 What is the pH after addition of 25.0 mL HCI? pH = What is the pH after addition of 50.0 mL HCI? pH = What is the pH after...
Question 2 of 2 A diprotic base (B) has pke values of 4.32 (pKb) and 8.64 (pK62 a) Which of the following equalities is true when the pH is 5.36? b) Which of the following equalities is true when the pH is 9.68? c) What is the predominant species of B at pH 3.22? d) What is the predominant species of B at pH 6.70?
3) a) What is the pKb for a weak base if the pH of a 0.125M solution of this weak base was found to be 8.16? 4) When a weak acid is added to water to make a 0.250M solution, the acid was found to be 1.5% ionized. What is the Ka and pKa of this weak acid? 5) At 60°C, Kw = 9.6x10-14 (Kw increases as the temperature increases). a) For pure water at 60°C, what is the [H+] and pH....
What is the pKb of a weak base KA if the pH of a 0.079-M solution of KA is 9.40?
What is the pKb of a weak base KA if the pH of a 0.075-M solution of KA is 9.99?
Consider a weak base that has a pKb of 4.2. • What is the pKa of this solution? • What is the pH of a 0.2 M solution of this base? • If you were to mix 50 mL of the 0.2 M base with 50 mL of a 0.1 M solution of its conjugate acid, what would the pH of this buffer be, and what is its effective buffering range?
2-aminoethanol is a weak base with a pkb=4.50. What is the pH of a 0.150 M 2-aminoethanol solution?
a). Calculate the fraction of the weak base in each of Adiprotic weak base (B) has pks values of 3.294 pm) and 5.765 ( p its three forms (B, BH, BH) a pH 9.883.
Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 230 mg/L . Express your answer to two decimal places.