simply identify the materials: phosphoric acid, sulfuric acid, ammonia (NH3) and hydrofluoric acid. The names are a giveaway. All the acids are acids. The ammonia, a base, was written intentionally to make it look like there was a free proton. However, it will be protonated to produce NH4, and can't protonate anything itself, except EXTREMELY strong bases. How can you do this yourself? Study enough to get familiar with the acids and bases and their reactions.
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A Bronsted acid is a proton (hydrogen +) donor.
simply identify the materials: phosphoric acid, sulfuric acid, ammonia (NH3) and hydrofluoric acid. The names are a giveaway. All the acids are acids. The ammonia, a base, was written intentionally to make it look like there was a free proton. However, it will be protonated to produce NH4, and can't protonate anything itself, except EXTREMELY strong bases. How can you do this yourself? Study enough to get familiar with the acids and bases and their reactions.