can someone help me out there can hemp me slve with two chemistry problems please!

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
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