POST-LAB QUESTIONS 1. Club soda is also called \"carbonated water.\" When the ca
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POST-LAB QUESTIONS 1. Club soda is also called "carbonated water." When the cap is removed from a bottle of soda, a gas is released. What is the gas? What test would identify the gas? What would you see when you do the test? 2. Brine is a heavily salted solution used for pickeling. What tests could be used to identify the ions present? What should you see when you do the tests? 3. An aspirin product on the market claims to use magnesium hydroxide, D2, as a buffering agent. How could you verify whether magnesium ions are present?Explanation / Answer
Q1) All carbonated drinks have dissolved CO2 gas.
Thus the gas is CO2 . It can be tested by passing it into clear lime water, which makes it milky to due to the formation of insoluble CaCO3.
the other test is to keep burning splinter near the mouth of bottle . it is extinguished as CO2 is not a supporter of combustion nor burns.
Q2) The solution has NaCl.
The presence of cl- ion is identified by the formation a white precipitate with AgNO3 solution, which is soluble in excess ammonia solution.
The presence of Na+ ion is identified by flame test , where it imparts golden yellow color to the flame.
3)The solution containing Mg+2 ions is is added with Na2HPO4 disodium hydrogen phosphate , a white precitate indicated the presence of Mg+2 ions.
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