George2

Which of the following when added to water will cause a significant change in the pH of the solution? 1 NH4HSO4 2 (NH4)2SO4 3 Na2SO4 I believe the answer is 1 & 2. is that right.

4) Which of the following is the most effective buffer system for a pH value of 4.45? a. H2CO3/HCO3- (K1 = 4.4 * 10-7) b. HCO3-/CO32- (K2 = 4.7 * 10-11) c. H2S/HS- (K1 = 1.0 * 10-7) d. HC2O4-/C2O42- (K2 = 5.0 * 10-5) e. H3PO4/H2PO4- (K1 = 7.5 * 10-3) I th...

A sample of ammonia (Kb = 1.8 * 10-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately Isn't it should be 5 right i believe.

Which of the following mixtures will be a buffer when dissolved in a liter of water? a. 0.1 mol Ca(OH)2 and 0.3 mol HI b. 0.3 mol NaCl and 0.3 mol HCl c. 0.4 mol NH3 and 0.4 mol HCl d. 0.2 mol HBr and 0.1 mol NaOH e. 0.2 mol H3PO4 and 0.1 mol NaOH i think...