Determine if the solutions when mixed are acidic or basic

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Question- Determine if the following solutions when mixed are acidic or basic - a) A 225 mL of a 0.5 M hydrofluoric acid solution was mixed with 150 mL of a 0.25 M calcium hydroxide solution. b) 13.4 grams of NH3 gas was bubbled into 634 mL of a 0.62 M nitric acid solution.

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