During the second week, suppose you decide to use volumetric analysis. For each

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

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