This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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You're on a roll — Step 1: State the property of oxygen for collection over water. The previous setup (Question 26) showed oxygen collected over water. This method is used for gases that are insoluble or sparingly soluble in water. 26. (b) Property: Slightly soluble in water Step 2: State one use of oxygen. Oxygen is essential for many processes. 26. (c) Use: Respiration (or combustion, welding, medical use, etc.) Step 3: Describe how to obtain gas Y from a mixture of X and Y. From the table: Gas X reacts with H_2SO_4. Gas Y is not affected by H_2SO_4. To separate them, pass the mixture through concentrated sulphuric acid. Gas X will react and be absorbed, while gas Y will pass through unaffected. 27. (a) Method: Pass the mixture of gases X and Y through concentrated sulphuric acid. Gas X will react and be absorbed, leaving gas Y to be collected. Step 4: Suggest an identity for gas X and provide a reason. From the table: Gas X is lighter than air. Gas X reacts with H_2SO_4 to form a salt (meaning it's a basic gas). Gas X dissolves without reacting in NaOH. Ammonia (NH_3) fits these properties. It is lighter than air (molar mass 17 g/mol), is a basic gas that reacts with acids to form salts, and dissolves in aqueous solutions like NaOH without reacting with the base itself. 27. (b) Identity and Reason: Ammonia (NH_3). It is lighter than air and reacts with acids to form salts. Just one more to go today!