How does aqueous co2 react with naoh

Universal indicator is located in the flammables cabinet. Procedure: Note: Use the demo camera to project the demo to the class. Place the sodium hydroxide and a few drops of universal indicator in the beaker 2. Note the color of the universal indicator. Add a piece of dry ice. The color of the solution will change as the dry ice reacts with the sodium hydroxide going from basic to neutral to an acidic solution. Add enough dry ice so that the sodium hydroxide is neutralized.

If the carbon dioxide is in excess, then when the NaOH runs out, an increase in the carbonic acid is seen and the solution becomes acidic as indicated by the universal indicator. Sodium hydroxide can irritate skin. Use proper protective equipment including gloves and safety glasses.

This question is a great opportunity to talk about state symbols, ionic bonding, and multi-step reactions. Firstly, this form doesn't necessarily tell us what molecules are interacting with one another.

Is one molecule of carbon dioxide colliding with one sodium hydroxide molecule to make a sodium bicarbonate molecule? In this case, no. Two different reactions happen in sequence. Secondly, the state symbols tell us important information about the reaction conditions. The aq state symbol tell us that the reaction is happening in aqueous conditions. That means the reactants are dissolved in water which can have a significant effect on how the reactants behave.

The aqueous conditions also mean that ionic compounds are separated into their constituent ions. As you might notice, that means our solution contains molecules of carbonic acid and basic hydroxide ions. A neutralisation reaction occurs. The basic hydroxide ions remove a proton from the carbonic acid to make water and a bicarbonate ion.

This is similar to how we don't explicitly include water in the one step equation - because we would have the same amount of water on each side of the equation. If we add the sodium ions we get something equivalent to the equation for the second step. To see the equivalence between the multi-step form and the shorter one step form we can add together the equations for the two steps to get an idea of what is happening overall.

So we've gone full circle, from a single summary equation, to the two reactions involved, back to the summary equation once again. The mechanism of reaction between the acidic oxide and the alkali depends on the concentration of the alkali solution.

Thus, only when the concentration of the alkali solution is quite low, the reaction proceeds via the formation of carbonic acid. But the acidic oxide is not completely neutralized in this case.

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Create a free Team What is Teams? Learn more. Asked 5 years, 3 months ago. Active 2 years ago. Viewed k times. Improve this question. You cannot obtain H2CO3 directly through chemical reaction.