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Which gas is used in the preparation of soda water?
Carbon dioxide
Oxygen
Nitrogen
Hydrogen
Carbon dioxide
Soda water is prepared by dissolving carbon dioxide (CO2тАЛ) gas in water under high pressure. This process, known as carbonation, creates a bubbly, slightly acidic drink.
Soda water is prepared by dissolving carbon dioxide (CO2тАЛ) gas in water under high pressure. This process, known as carbonation, creates a bubbly, slightly acidic drink.
Think of it like a crowded room; under high pressure (the sealed bottle), the gas molecules are forced to stay packed in the water. As soon as you open the lid, the 'pressure' is off, and the gas molecules rush out to find more space, creating effervescence.
Fizzy Drinks Need Carbon (FDNC) тЖТ CO2тАЛ for carbonation.
CO2тАЛ+H2тАЛOтЗМH2тАЛCO3тАЛ тАФ Formation of carbonic acid in water
C=kHтАЛтЛЕP тАФ Henry's Law equation where C is concentration and P is partial pressure
The mechanism relies on Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. When the bottle is sealed under high CO2тАЛ pressure, the gas dissolves into the water. When the seal is opened, the pressure drops, causing the dissolved gas to escape as bubbles, forming carbonic acid (H2тАЛCO3тАЛ).
Carbon dioxide provides the characteristic sharp, acidic taste to soda water.
The solubility of gases decreases as temperature increases, which is why warm soda loses its fizz faster.
Soda water is also known as carbonated water or sparkling water.
Provides a refreshing taste and mouthfeel.
Often used as a digestive aid to relieve stomach discomfort.
Can cause bloating or gas in some individuals.
Slightly acidic nature may erode tooth enamel with excessive long-term consumption.
Used as a mixer in cocktails and mocktails.
Used in food processing for carbonating soft drinks.
Option B (Oxygen) is not soluble in water to a significant extent to produce bubbles.
Option C (Nitrogen) is sometimes used in 'nitro' beverages to create smaller bubbles but is not the standard for 'soda water'.
Option D (Hydrogen) is highly flammable and not used for food-grade carbonation.
A is correct тАФ Carbon dioxide is the gas forced into water under pressure to create the effervescence found in soda water.
Remember that gas solubility in liquids generally decreases as temperature increases; this is a common principle tested in both Chemistry and Environmental Science sections.
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