1. How many grams of NH4Cl and NH4OH must you add to 250 mL of water to make a buffer of pH = 9.5? KB = 1.8x10-5
2. How many milliliters of 0.8 M NaOH must be added to 80 mL of 1.5 M H2Tart to make a buffer of pH = 6?
H2Tart ⇆ H+ + HTart- KA1 = 6.31x10-4
HTart- ⇆ H+ + Tart2- KA2 = 4.57x10-6