Does adding salt to freshwater aquariums change the Ph level of water?

No, adding salt to a freshwater aquarium does not typically change the pH level of the water. Salt, or sodium chloride (NaCl), is a neutral compound and does not affect the pH of the water. The pH level of a freshwater aquarium is primarily influenced by the presence of acids and bases in the water, such as dissolved carbon dioxide, carbonates, and bicarbonates.