The citric acid makes the sodium bicarbonate more soluble in water. Old chemistry trick, still used in a lot of detergents. Alka-Selter works because it contains aspirin imho. Citric acid is also used in cheesemaking.
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What you can do with Visual Voicemail. 1  View all your voicemail messages as a list before deciding which ones to listen to. 2  Listen to voicemail messages in any order. 3  Reply to voicemail messages with one touch via phone, text message, or email.  Manage your voicemail message 1  inbox. Save voicemail audio files to the phone or SD card.