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secondary 4 | Chemistry
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Jane
Jane

secondary 4 chevron_right Chemistry chevron_right Singapore

Why is the answer D though?

Date Posted: 2 years ago
Views: 309
J
J
2 years ago
A is not a neutralisation reaction as it is just the formation of an ionic compound sodium nitrate (NaNO3) by the electrostatic attraction/ ionic bonding between positively charged sodium cation (Na+) and negatively charged nitrate anion (NO3-)
J
J
2 years ago
B is obviously incorrect as Na+ and H+ ion can't react to give you H2O (the equation is not even correctly balanced and makes no sense, since O appears out of nowhere on the products side)

Same for C since the N in NO3 disappeared on the products side.
J
J
2 years ago
For this reaction , the full equation is :

HNO3 + NaOH → NaNO3 + H2O

In dilute nitric acid,

HNO3 dissociates in water to yield H+ and NO3- ions.

The H+ ions (hydrogen ions or otherwise known as protons, since H atoms have no neutrons and so H+ ions are effectively just lone protons) are what makes the solution acidic.


In aqueous sodium hydroxide,

NaOH dissociates in water to yield sodium ions (Na+) and hydroxide ions (OH-)

The hydroxide ions are what makes the solution basic/alkaline .



So , the H+ and OH- ions react to form the neutral H2O (water molecules)

H+ + OH- → H2O

Hence the term 'neutralisation'


The Na+ and NO3- ions do not take part in neutralisation and are called spectator ions.

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