write equalibrium reaction Activity D. Solubility of Carbon Dioxide to the follo

Question

write equalibrium reaction Activity D. Solubility of Carbon Dioxide to the following when carbon dioxide dissolves in water, it forms a weakly acidic solution due reversible reaction: Equation 6 2co20g) H20 (e) e, (aq) The hydrogen ion concentration in solution depends on the amount of dissolved carbon dioxide According to Henry's Law, the amount of gas dissolved in solution is proportional to the pressure of the gas above the solution. Initial Conditions When carbon dioxide dissolves in water, it forms a weakly acidic solution due to the following reversible reaction: 2co2 (g) H20 (e) CO2 (aq) H (aq) HCO3 (aq) The hydrogen ion concentration in solution depends on the amount of dissolved carbon dioxide. According to Henry's law, the amount of gas dissolved in solution is proportional to the pressure of the gas above the solution. Obtain approximately 10 mL of fresh seltzer water in a 50-mL beaker. Add about 20 drops of 0.04% bromcresol green indicator. Swirl to mix the solution. Draw up about 10 mLof the seltzer/indicator solution into a 30-mL syringe. Seal the syringe by pushing a tip cap firmly onto its open end. Procedure Observations Explanation Initial color of seltzer water and bromcresol green solution Pull back on syringe to create a decrease in pressure (arger overall volume hold plunger stead and shake until bubbles top forming ush syringe in to increase essure (smaller overall lume); hold syringe steady 13 Flinn Scientific

Explanation / Answer

Experiment with seltzer water with bromocreasol green indicator

Table : Procedure-Observation-Explanation

[A] Initial color of solution : Yellow coloration of the solution. Initial pH of seltzer water is about 4.0. At this pH large amount of CO2 is dissolved in water. High concentration of H2CO3 in solution, gives high overall H+ concentration.

H2O(l) + CO2(g) <==> H2CO3(aq) [high] + CO2(g) <==> H+(aq) [high] + HCO3^2-(aq) + CO2(g)

[B] Pull back syringe, low pressure with larger volume of solution : Blue coloration. Decrease in pressure causes dissolved amount of CO2 in solution to decrease. This in turn reduces the concentration of H2CO3 and H+ in solution. pH increases and blue color of solution is seen.

H2O(l) + CO2(g) <==> H2CO3(aq) [low] + CO2(g) <==> H+(aq) [low] + HCO3^2-(aq) + CO2(g)

[C] Push syringe, increase pressure with smaller overall volume : Yellow color solution. Increase in pressure allows for more CO2 to dissolve in water. Greater concentration of CO2 means greater amount of H2CO3 and higher H+ formation. This thus gives yellow coloration to the solution.

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