On opening the soda water bottle the dissolved CO2 comes out. Wouldthe pH of the solution increase or decrease as the gas comes out?Explain your answer either way.A solution ‘X’ gives orange colour when a drop of universal indicatoris added to it. On the other hand, another solution ‘Y’ gives bluish-green colour when a drop of universal indicator is added to it.Whatare the types of solution ‘X’ and ‘Y’ and what type of pH would theyhave?
Question
On opening the soda water bottle the dissolved CO2 comes out. Wouldthe pH of the solution increase or decrease as the gas comes out?Explain your answer either way.A solution ‘X’ gives orange colour when a drop of universal indicatoris added to it. On the other hand, another solution ‘Y’ gives bluish-green colour when a drop of universal indicator is added to it.Whatare the types of solution ‘X’ and ‘Y’ and what type of pH would theyhave?
Solution
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When a soda water bottle is opened, the dissolved CO2 comes out. This would increase the pH of the solution. Here's why: CO2 in water forms carbonic acid, which is a weak acid. When the CO2 escapes, the concentration of the acid decreases, thus reducing the acidity of the solution and increasing the pH.
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A solution that turns orange when a drop of universal indicator is added to it is likely to be an acidic solution. This is because universal indicators turn orange-red under acidic conditions, which typically have a pH less than 7.
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A solution that turns bluish-green when a drop of universal indicator is added to it is likely to be a basic (alkaline) solution. This is because universal indicators turn blue-green under basic conditions, which typically have a pH greater than 7.
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