An aqueous solution containing bromothymol blue is used to identify the chemical properties of thionyl chloride gas. When the gas is bubbled through the bromothymol blue solution color changes from blue to yellow we could say that the gas ____________________.
Question 4 options:
1) produces a basic solution when it reacts with water.
2) reacts with water to produce an acidic solution.
3) is chemically inert.
4) is chemically reactive and reacts with water to produce a strongly basic solution.
5) is an odorless but toxic gas.
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Bromothymol blue is yellow in acid and blue in basic solution.
The correct answer is:
2) reacts with water to produce an acidic solution.
To determine the answer to this question, we need to understand the chemical properties of thionyl chloride gas and its reaction with water. Thionyl chloride (SOCl2) is a highly reactive chemical compound commonly used as a reagent in organic synthesis.
When thionyl chloride reacts with water, it undergoes a hydrolysis reaction. This reaction can be summarised as follows:
SOCl2 + H2O → SO2 + 2HCl
In this reaction, thionyl chloride reacts with water to produce sulfur dioxide (SO2) and hydrochloric acid (HCl). Hydrochloric acid is a strong acid, while sulfur dioxide is a weak acidic gas. Therefore, the overall reaction of thionyl chloride with water produces an acidic solution.
Now, going back to the information provided in the question, it states that when thionyl chloride is bubbled through a bromothymol blue solution, the color changes from blue to yellow. This color change indicates the presence of an acidic solution.
Based on these explanations and observations, we can conclude that option 2) "reacts with water to produce an acidic solution" is the correct answer.