Sulphuric Acid: Chemical Properties

Sulphuric Acid: Chemical Properties


Let’s see some reactions of sulfuric
acid. That is letís study the chemical properties of sulfuric acid. We know the reaction of a base with an
acid. Whenever the base reacts with an acid it forms salt and water. This reaction is
known as neutralization reaction. So our acid in this case is sulfuric acid. Whenever
it reacts with the base that is a metallic oxide. It forms the
corresponding salt and water. So we see that sulfuric acid reacts with copper oxide to form
copper sulfate and water. Similarly it reacts with iron oxide to form
iron sulfate and water at the same time the metal hydroxides,
they are also bases so the acid in this case sulfuric acid reacts with the metal
hydroxide to form the corresponding salts and water. So if we have magnesium
hydroxide it reacts with sulfuric acid to form the corresponding salt
magnesium sulfate and it releases water. So, a base reacts with an acid to
form salt and water. Whenever you see a carbonate or a bicarbonate be
sure that it always releases carbon dioxide gas whenever it reacts with an acid
in this case we have sodium carbonate and sodium bicarbonate.
So when they reacts with sulfuric acid they form the corresponding salts, water
and they release carbon dioxide gas. So whenever the carbonates and bi-carbonates
react with an acid in this case sulfuric acid they form the
corresponding salts, water and release carbon dioxide gas. So we can
generalize this. We have any carbonate or bicarbonate reacting with sulfuric
acid to give the corresponding salt, water and carbon dioxide gas. Similar is the
case with sulfites and bisulfites whenever the sulfites and bisulfites react
with acid in this case sulfuric acid, they form the
corresponding salt, water and release sulfur dioxide gas. So the carbonates and bicarbonate
they release carbon dioxide gas. The sulfites and bisulfites release sulfur
dioxide gas. So we can generalize this The sulfites and bisulfites always reacts with
acid in this case sulfuric acid to form the corresponding salts, Water and release sulfur dioxide gas. Now lets see the action of dilute sulfuric acid on metals.
So, when dilute sulfuric acid reacts with metals we have seen this
reaction that there is displacement of hydrogen. So this magnesium, displaces hydrogen
it forms the corresponding salt magnesium sulfate and hydrogen gas is
released. Similarly zinc when it reacts with
sulfuric acid hydrogen gas is displaced and it forms the
corresponding salt zinc sulfate. But what happens when these metals react with
concentrated sulfuric acid. In that case when There is concentrated sulfuric acid so they form the corresponding salts, water but at the same time they also release sulfur dioxide gas. The addition of oxygen to any species is
known as oxidation. In this case sulfur is getting oxidized. So, concentrated sulfuric acid acts as an
oxidizing agent. So, whenever metals react with dilute
sulfuric acid they displaces hydrogen gas but when metals react with concentrated
sulfuric acid they form the corresponding salt, water and they release sulfur dioxide gas. So concentrated sulfuric acid acts as an oxidizing agent. It oxidizes the metals and non-metals. So we have seen the reaction on metals. Let’s see how concentrated sulfuric acid
reacts with non-metals. So, now we have carbon and sulfur the are non-metals
when they react with concentrated sulfuric acid, we know that concentrated sulfuric acid acts as an oxidizing agent. In this case when it reacts with carbon It oxidizes carbon to form carbon dioxide,
it forms water and at the same time it forms sulfur dioxide. So it acts as an oxidizing agent similarly with sulfur it forms sulfur dioxide and water. So we see that
concentrated sulfuric acid acts as an oxidizing agent. So dilute sulfuric acid gives the
Normal test as all acids. When metals reacts with dilute acids they form
hydrogen gas and form the corresponding salts. But when metals react with concentrated
sulfuric acid they give the oxidation products. That is
concentrated sulfuric acid acts as an oxidizing agent. It oxidizes the metals and non-metals. Dilute sulfuric acid acts as an
oxidizing agent is that true or false? We know that dilute sulfuric it
acts as an acid, when a metal reacts with dilute sulfuric acid it forms the
corresponding salt and releases hydrogen gas. So dilute sulfuric
does not act as an oxidizing agent. So, the given statement is false.
Concentrated sulfuric acid acts as an oxidizing agent. Another important reaction of concentrated
sulfuric acid is that it acts as a dehydrating agent. From dehydrating we mean that it helps
to remove water. So, when it reacts with HCOOH it removes water molecule, so we get carbon monoxide and water. So
concentrated sulfuric acid has a very important property It always try to remove water
molecules and so it has dehydrating nature. Similarly when it reacts with C2H5OH, it removes
a water molecule in C2H5OH So, now this is ethanol molecule, when water is removed it forms C2H4 as we can see
and water is formed. So concentrated sulfuric acid acts as a
dehydrating substance, it acts as a dehydrating Agent. From dehydrating agents we mean
that it helps in the removal of water. This is a very interesting reaction of
a sugar reacting with concentrated sulfuric acid. Observe what happens, so we have sugar or glucose we add some
concentrated sulfuric acid and then the mixture is thoroughly stirred. So you see that it turns blackish and then this black substance starts
rising out of the beaker. It appears like a snake which is known as carbon snake. So in this case concentrated sulfuric
acid acts as a dehydrating agent we take sugar or glucose so there
is removal of water from this glucose by concentrated sulfuric acid. It
results in the formation of Carbon, this is the black substance that
We saw. Carbon is black in color which appears as a carbon snake. So concentrated
sulfuric acid acts as a dehydrating agent. In this case when it reacts with sugar
and causes dehydration that is known as charring of sugar. So in this case concentrated sulfuric
acid is acting as a dehydrating agent. Similarly if we have a hydrated
crystal for example copper sulfate crystal again it removes the water molecule
so it results in the formation of anhydrous copper sulfate and forms water. Another important property of
concentrated sulfuric acid is that it is non volatile in nature. By non volatile we mean that it has a very
high boiling point of three hundred and thirty eight degrees Celsius. This is
a very high boiling point so it cannot easily change into the vapour state. So
from a non volatile or less volatile acid we can form a more volatile acid. So when a salt
reacts with an acid it forms another salt and another acid. It this case H2SO4 is
less volatile or non volatile and that leads to the formation of another
acid that is HCL which is more volatile it can easily change into the vapour
for. So, the concentrated sulfuric acid has a property that it is non-volatile in nature. So we have seen that dilute sulfuric acid
acts as an acid that is when metals react with dilute sulfuric
acid they form the corresponding salt and hydrogen gas is released. But
concentrated sulfuric acid, it acts as an oxidizing agent. It oxidizes the metals and nonmetals. It
acts as a dehydrating agent. It always tries to remove water molecules and
it has a non volatile nature. So, from a non-volatile acid, sulfuric acid, we can
prepare a less volatile hydrochloric acid. So these are the
properties of dilute and concentrated sulfuric acids.

39 thoughts on “Sulphuric Acid: Chemical Properties

  1. i wish i had a lecturer like you.. i would understand everything and laugh throughout the whole lesson more please and thanks it has helped me for quick revision for my exam thanks alot

  2. But i hav studied when Zn.reacts with 90% concentrated sulfuric acid so h2s znso4 and water are produced .. Will u plz elaborate?

  3. thanks very helpful and easy explaination uload more videos for 10th grade icse chemistry, physics and bio if u can…mostly chemistry is required.

  4. Sulfur is being oxidised, so concentrated sulfuric acid is the oxidising agent? Oxidation is the addition of oxygen to a species? This is not right. Conc. sulfuric acid oxidises something else but itself undergoes reduction. Oxidation is the loss of electrons in redox reactions…

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