help!!!!!!!?

Question

please can anyone write a detailed description of a sodium bicarbonate tablet added to a glass of water?

Answer 1

Steve is correct, Titanium is wrong.

I want to clarify something, NaHCO3 is Sodium Bicarbonate.

NaHCO3 + H2O yields Na+ + H2CO3 + OH-

Since Na doesn't participate in the reaction, we can leave it out. That is what Steve did.

Now, he is also correct about the H2CO3... well, he has a few typos, but he is completely correct.

Note about Titanium's statement... These sodium bicarbonate tabs will turn a Phenolphthalein solution pink. This discredits Titanium's assumption due to his lack of evidence of where this basicity comes from.

Answer 2

Sodium bicarbonate is a weak base that weakly ionizes in water:

NaHCO3 + H2O --> H2CO3 + OH- + Na+

However, if your sodium bicarbonate tablet contains acid in it, you can observe bubbles when you dissolve it in water. The gas formation is due to CO2. The reaction is

NaHCO3 + H+ --> Na+ + H2O + CO2(g)

Answer 3

Assuming no vinegar or stuff:

The NaHCO3 dissolves in water, dissociating into Na+ ions and HCO3- ions. The HCO3- ions react with the water according to:

HCO3- + H2O ===> H3CO2 + OH-

Some people may argue whether H2CO3 exists. It may be CO2*H2O complex. Anyway, the OH- concentration in the water is enough to turn phenolphthalein pink.