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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Here are the answers to Question 2 and Question 3: Question 2: a) To prevent contamination of the sample, damage to the balance pan, and to ensure accurate measurements. Direct contact can also lead to corrosion of the pan or residue buildup. b) Sodium hydroxide is hygroscopic and deliquescent, meaning it readily absorbs moisture and carbon dioxide from the air. This causes its mass to change rapidly and its purity to be uncertain, making it impossible to weigh accurately to prepare a solution of precisely known concentration (i.e., as a primary standard). c) A titrant is a solution of known concentration, typically placed in a burette, which is added incrementally to another solution (the analyte) to determine the concentration of the analyte in a titration. d) Two limitations of conductometric titration are: • It is not suitable for very dilute or very concentrated solutions. • Temperature must be carefully controlled as conductivity is highly temperature-dependent. e) ❌ False. Weighing by difference reduces the risk of spillage inside the balance, but it does not prevent it from ever occurring. Question 3: a) Two acid-base indicators are: • Phenolphthalein • Methyl orange b) The color change of phenolphthalein is: • In acidic solutions: Colorless • In basic solutions: Pink or magenta c) Methyl orange exhibits a yellow color in a basic solution. d) Calibration of an analytical balance is the process of adjusting the balance to ensure it provides accurate and precise measurements by comparing its readings against certified reference weights and making necessary adjustments. e) Two characteristics of a primary standard are: • High purity (typically 99.9\%) • High stability (does not absorb moisture or react with air) f) The accuracy of a weighing balance refers to how close a measured mass value is to the true or actual mass of the object being weighed. Send me the next one 📸