theoretical pH

Question

14-0.5(pKb-log[base]) = ?
please help

Answer 1

What's the question? Something is missing.

Answer 2

sorry 0.1 M NH4OH has pH 9.8 so I need the theoretical pH for 14 - 0.5(pKb-log [base])=?
also 0.1 M HAc pH=2.5 theoretical pH
0.5 (pKa-log [acid])= ?
Gratefull for help