During the second week, suppose you decide to use volumetric analysis. For each
ID: 872768 • Letter: D
Question
During the second week, suppose you decide to use volumetric analysis. For each of the unknown compounds on the left, choose the proper titrant (standard solution) and indicator from the drop-down box. There are three indicators for you to choose from: bromothymol blue, phenolphthalein, and methyl orange. Hints: . HCI is a strong acid; . NaOH is a strong base; CH3COONa, Na2C2O4 are basic salts that form weak bases in aqueous solutions; . NH4Cl is an acidic salt that forms weak acid in an aqueous solution.Explanation / Answer
An appropriate indicator for an acid-base titration will change colour at the same pH as the equivalence point of the acid-base reaction. Thus:
CH3COONa HCl - methyl orange
Na2CO3 HCl- phenolphthalein, and then methyl orange (since carbonic acid has 2 equivalence points, it needs two indicators)
Na2C2O4 HCl- phenolphthalein, and then methyl orange (since oxalic acid has 2 equivalence points, it needs two indicators)
NH4Cl NaOH- Phenolphthalein
NaOH HCl-Bromothymol blue
Have a great day, remember to rate the answer
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.