(1) The weak monoprotic acid HA is 2.5% dissociated in 0.10 mol·L-1solution. What is the acidity constant, Ka, of HA?(2)A certain solution of HA has a pH=2.51. What is the concentration of the solution?
举一反三
- What is the pH value of 0.1 mol/L HA solution? pKa (HA) = 5.0 ( ) A: 6.0 B: 8.0 C: 7.0 D: 9.0
- Which of these statements is true regarding a 0.1M solution of a weak acid HA? A: The pH is 1.00. B: [H+]< [OH-] C: [H+]= [OH-] D: The pH is more than 1.00.
- Which of these statements is true regarding a 0.1M solution of a strong acid HA? A: The pH is 0.00. B: [H+]< [OH-] C: [H+]= [OH-] D: The pH is 1.00.
- What is the volume ratio of HCl solutionto NH3·H2O (pKb=4.75)solution when abuffer solution atpH9.25 is prepared with the same concentration of HCl solutionand NH3·H2Osolutions A: 1:1 B: 1:2 C: 2:1 D: 3:1
- 用0.10 mol/LNaOH溶液滴定0.10 mol/L HA(Ka=5.000d710-5), 若终点的pH为9.0, 则终点误差为