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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As long as you have a signal, you will be able to send and receive text messages from a cruise ship. Even better, texting costs a lot less than a voice call. Most major carriers charge $0.50 to send a message; AT&T also charges $1.30 for an outgoing picture or video message.o ensure you are not charged by your phone company, you have two choices: Turn off your phone as soon as your cruise ship leaves port, or, if you want to use offline applications, put your phone into airplane mode.