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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Get help with visual voicemail on your iPhone. Your iPhone might have one of these issues: 1  When you tap the Voicemail button, iPhone calls voicemail instead of showing the visual voicemail list.2  You see duplicate or multiple copies of a voicemail message. 3  When you tap a voicemail message to listen to it, nothing happens.et help with visual voicemail on your iPhone. Your iPhone might have one of these issues: 1  When you tap the Voicemail button, iPhone calls voicemail instead of showing the visual voicemail list.