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A solution containing an unspecified amount of HCl and ammonia (NH3) has a pH of 8.56. What is the ratio of NH3 to NH4+ in the solution? (For NH3, Kb = 1.8 × 10–5) 1. 0.131 2. 0.202 3. 5.6 × 10–10 4. cannot be determined 5. 0.273 6. 3.66 7. 4.95