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Confusing? NH3 is a weak base (Kb = 1.8 × 10–5) so the salt NH4Cl acts as weak acid. What is the pH of a solution that is 0.043 M in NH4Cl at 25 °C? How do I prove this identity using vectors? How do I find the mph pace for walking 2 miles in 33 minutes and 30 seconds? Solve log2 2m > log2 (m + 5).?