How many grams of dry NH4Cl need to be added to 2.50 L of a 0.700 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.62? Kbfor ammonia is 1.8×10−5.
Express your answer with the appropriate units.
pH = pKb + log10([salt]/[base])
[base] = 2.5 * 0.7 = 1.75 M
pkb = -log10(1.8*10-5) = 5.7447
14 - 8.62 = 4.7447 + log([salt]/1.75)
log([salt]/1.75) = 0.6353
[salt] = 7.5568 M
[salt] = mass/volume = mass/2.5 = 7.5568
mass of salt to be added = 18.892 g.
Hope this helps!
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.700...
How many grams of dry NH4Cl need to be added to 2.00 L of a 0.700 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8×10−5. Express your answer with the appropriate units.
How many grams of dry NH4Cl need to be added to 1.50 L of a 0.700 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.56? Kb for ammonia is 1.8×10−5.
How many grams of dry NH4Cl need to be added to 1.90 L of a 0.800 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8×10^−5. Express your answer with the appropriate units.
4B. How many grams of dry NH4Cl need to be added to 1.80 L of a 0.100 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.93? Kb for ammonia is 1.8×10^−5. Express your answer with the appropriate units.
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8*10^-5.
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.400 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.67? Kb for ammonia is 1.8×10−5.
How many grams of dry NH4Cl need to be added to 1.70 L of a 0.100 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.62? Kb for ammonia is 1.8×10−5.
How many grams of dry NH4Cl need to be added to 2.10 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.76? Kb for ammonia is 1.8×10−5. Express your answer with the appropriate units.
How many grams of dry NH4Cl need to be added to 1.90 L of a 0.800 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8×10^-5.
How many grams of dry NH4Cl need to be added to 1.70 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.51? Kb for ammonia is 1.8 x 10^-5.