MediumChemistryHigh School (9–10)GeneralCarbon and Its Compounds › Reactions and Uses of Carbon CompoundsNumerical

A bottle of vinegar says: 6 g of ethanoic acid in every 100 mL.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A bottle of vinegar says: $6\ \text{g}$ of ethanoic acid in every $100\ \text{mL}$ . What is the concentration in mol/L? What mass of sodium hydroxide would neutralise $100\ \text{mL}$ of it? ( $\text{CH}_3\text{COOH} = 60\ \text{g/mol}$ , $\text{NaOH} = 40\ \text{g/mol}$ ; they react one mole to one mole.)

Need a reminder? The key ideaShow

Ethanol, $46\ \text{g/mol}$ , gives hydrogen with sodium, and ethene with hot concentrated sulphuric acid. Ethanoic acid, $60\ \text{g/mol}$ , is a weak acid: it turns blue litmus red and fizzes with carbonates. Acid + alcohol, with a few drops of concentrated sulphuric acid, gives an ester and water.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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← Two colourless liquids are in unlabelled bottles.Ethanol reacts with sodium: 2 Na + 2 C₂H₅OH → 2 C₂H₅ONa + H₂. →

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