Home › WAEC WASSCE › Chemistry › Stoichiometry of Chemical Reactions › About what fraction of acetic acid molecules are…
About what fraction of acetic acid molecules are in the ionized form in water under typical conditions?
AAlmost all of them
BAbout half of them
CAbout ten per cent
DAbout one per cent
Answer & Solution
Correct answer: D. About one per cent
1. Acetic acid is a weak acid, so it reacts only partly with water.
2. Under typical conditions about 1% of the molecules are present as the acetate ion.
3. The remaining 99% stay as intact acetic acid molecules.
4. A double arrow in the equation marks this partial reaction.
5. A strong acid such as HCl would instead react essentially completely.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
Related questions
In the reaction between sodium and chlorine, sodium is oxidised, which means chlorine:Ordering the three ways of writing a reaction from most to least detail about ions gives:When one element appears in more than one formula on the same side of an equation, you musWhen balancing a combustion equation, an odd number of oxygen atoms on the product side isCompounds that produce hydroxide ions by chemically reacting with water, rather than by diA double arrow is used in an acid equation to indicate that the acid is:A neutralisation reaction has an acid and a base as reactants and typically produces:Sodium hydroxide is classified as a strong base because in water it: