Did the pH of the water increase or decrease as you added CO_2 (by blowing throu

Question

Did the pH of the water increase or decrease as you added CO_2 (by blowing through the)? Write the chemical reactions that explain what happened when you air into the water. Answer: CO_2 (g) + H_2 O (l) rightarrow H_2 CO_3 rightarrow H^+ (aq) + HCO_3 (aq) The pH sensor measures the concentration of H^+. Did the pH of the seltzer water increase or decrease when it was poured between beakers? Infer what accounts for the change in pH in Question 2. Most textbooks say that a glass of pure, uncontaminated water has a neutral pH of 7. Why is that most often not the case?

Explanation / Answer

2.A. pH of selzer water (carbonated water) increases when it is poured between the beakers.

3.A. The released gas of Cabondioxide (acidic) gas from the water is responsible for increase in pH reducing the amount of acid in the water

4.A. H2O is in equilibrium with H+ and OH- all the time. H2O is continously dissociating and H+ and OH- are continuously combining.And there is always a non zero concentration of H+ ions in solution.

The dissociation constant for water is at 25oC which makes the pH of pure water at 25oC slightly acidic at room temperature. For higher temperatures, due to the dissociation constant increasing the pH of pure water to near 6(pH).

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