In order to determine the effect of exercise on the rate of CO2 production we wi

Question

In order to determine the effect of exercise on the rate of CO2 production we will fill a beaker with 200ml of distilled water, next we will add 5ml of 0.1M NaOH and 2 drops of phenolphthalein (which is a pH indicator). The pH indicator is dark pink in alkaline solutions, and clear in neutral or acidic solutions. You will now split the solution in half to use for 2 portions of the expiriment. Next while sitting quietly and breathing normally you will inhale the air in the room and exhale into the sloution through a straw until the solution is clear and note the time it takes for the solution to be clear (95 seconds). You will repeat this process with a second set of the same solution after vigorous exercise and record the time it takes for the solution to appear (20 seconds).

What chemical reaction occured in the beakers? Write out the reaction with arrows pointing in appropriate direction that the reaction occurs, if the reaction is able to go in more than one direction indicate so.

Explanation / Answer

2 NaOH(aq) + CO2(g) Na2CO3(aq) + H2O(l)

the compound formed is from NaOH(basic) to neutral and should not be NaHCO3 which is basic in nature.

further addition of CO2 should give
CO2(g) + H2O(l) H2CO3(aq)
which is acidic in nature

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