Vitamin C ........ Pros come here!

A student

2007-03-29 4:17 am

I bought a kind of Vitamin Ca-C tablets which I don't know much about it. It can dissolve in water and you will see bubbles coming out from the Vitamin C tablet. Then soon the water will become yellow and taste sour ( which is the Vit C) . I've searched the information about this and I'm still confused. I need a good explaination of the process and better with a equation.

更新1:

THANKS A LOT! But there's 1 more thing confusing me. When I finished the drink, I found some salt left in the glass. Why there is salt?

回答 (1)

Uncle Michael

2007-03-29 4:44 am

✔ 最佳答案

The tablet contains vitamin C (usually 1 g) and some other substances.

The tablet usually contains at least a colouring agent. When the tablet dissolves in water, the solution becomes coloured and looks like fruit juice. For example, an orange-yellow solution will look like orange juice.

The tablet also contains a solid acid and sodium hydrogencarbonate. When the tablet dissolves in water, the solid acid dissolves and ionizes to give hydrogen ions, which will react with the sodium hydrogencarbonate to give carbon dioxide gas. Therefore, gas bubbles are observed.
H+ + HCO3- → H2O + CO2

The tablet also contains some flavoring agent (e.g. orange flavor) and some other additives.

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