June 2009 Chemistry Regents #71-73

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Base your answers to questions 71 through 73 on the information below. A soft-drink bottling plant makes a colorless, slightly acidic carbonated beverage called soda water. During production of the beverage, CO2(g) is dissolved in water at a pressure greater than 1 atmosphere. The bottle containing the solution is capped to maintain that pressure above the solution. As soon as the bottle is opened, fizzing occurs due to CO2(g) being released from the solution. 71 Explain why CO2(g) is released when a bottle of soda water is opened. [1] HIGHLIGHT TO SEE THE ANSWER The pressure above the solution decreases, so the CO2(g) is less soluble in the solution. The pressure is less, so the CO2 has lower solubility. 72 Write the chemical name of the acid in soda water. [1] HIGHLIGHT TO SEE THE ANSWER carbonic acid 73 State the relationship between the solubility of CO2(g) in water and the temperature of the aqueous solution. [1] HIGHLIGHT TO SEE THE ANSWER The solubility of CO2(g) decreases as the temperature of the solution increases. As temperature decreases, solubility of CO2 increases. Next Questions

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