Properties of acid

1. Chemical Properties
Of Acids
Presentation by-Daksh, Aryan, Chetan,
Deepak, Dhruv, Divyansh

2. What
are
Acids ?
•An acid is a chemical substance,
usually a liquid, which contains
hydrogen and can react with
other substances to form salts.
Some acids burn or dissolve
other substances that they
meet.
•An acid has PH level between
1-6 on a PH scale.

3. Properties Of
Acid
There are mainly two
properties of acids:-
1.Physical properties
2.Chemical properties

4. Physical properties of Acids
1. Natural indicators
2. Artificial indicators
3. Olfactory indicators
4. Acids are sour in taste.
Chemical properties of Acids
1.Reaction with active metals to yield hydrogen
gas.
2.Reaction with water.
3.Reaction with bases to produce a salt compound.

5. NATURAL INDICATORS
• Indicators are chemical compounds that
tell us whether a substance is acidic or
basic by changing its colour. When added
to an acidic solution or a basic solution,
indicators change their colour and this
change in colour is different for the
acids and bases. The indicator thus help
us to decide whether a given solution is
acidic or basic in nature.

6. SOME
EXAMPLES
OF NATURAL
INDICATORS
:-
 LITMUS :-
• IT IS A COMMONLY USED INDICATOR. WHEN ADDED
TO AN ACIDIC SOLUTION IT TURNS RED AND WHEN
ADDED TO BASIC SOLUTION IT TURNS BLUE.
 TURMERIC :-
TURMERIC IS YELLOW IN NEUTRAL SOLUTIONS.
TURMERIC IS LIGHT YELLOW ACIDIC SOLUTIONS.
TURMERIC IS RED IN BASIC SOLUTIONS.
 CHINA ROSE PETALS :
CHINA ROSE INDICATOR IS PINK IN NEUTRAL
SOLUTIONS.
CHINA ROSE INDICATOR IS DARK PINK IN ACIDIC
SOLUTIONS.
CHINA ROSE IS GREEN IN BASIC SOLUTIONS.
 HYDRANGEA FLOWER -:
• IT TURNS PINK IN BASIC SOIL

7. ARTIFICIAL INDICATORS
 Indicators prepared from artificial substances are known as synthetic
indicators .
• Some examples of artificial indicators are :-
 Phenolphthalein - this indicator is colourless in acidic and neutral
solution and gives pink colour in basic medium. It is majorly use in
- base titration.
Methyl orange- In acidic solutions it's colour is red and in basic and
neutral solution its colour changes into yellow.

8. Olfactory
Indicators
• An Olfactory indicator is a substance whose
smell varies depending on whether it is mixed
with an acidic or basic solution. Olfactory
indicators can be used in the laboratory to test
whether a solution is a base or an acid, a
process called olfactory titration.
• Simply put, olfactory indicators are substances
which have a different odour in acid and base
solutions.

9. SOME OF THE EXAMPLES OF OLFACTORY
INDICATORSVanilla:-
extract has a characteristic pleasant smell; its smell don't
get suppress when we add acid, but its smell gets suppress
when we add base in it.
onion:-
The onion bulbs have anthocyanins pigments which can
be used as an indicator. The
red onion skin indicator changes color from pale red in
acid solution and green in basic solution.
clove oil:-
Clove oil smells as such in the presence of acid but the

11. Reaction with metal
When an acid reacts with a metal then Hydrogen
gas is evolved along with corresponding salt.

12. Reaction with carbonates
All reaction between carbonates and acid has the same
form. i.e. Carbonate + acid -> salt +water + carbon dioxide

13. Some examples of reaction between acid
and carbonates

14. Reaction with
Hydrogen
Carbonates
All reaction between
Acid and hydrogen
carbonates are in
same form i.e.
acid + hydrogen
carbonate → salt +
water + carbon
dioxide

17. Reaction of Acids with
Metallic oxides
Metal oxides are Generally Basic in Nature. But some
are amphoteric also. There General reaction with acid
is -:
Acid + Metal oxide = Salt + Water

18. For Example -:
ZnO
+
HCl
=
ZnCl2
+
H2O

19. What Happens to an Acid in a Water
Solution?
In water Acids produce
Hydrogen ion or
Hydronium ion and
conduct electricity
Acids do not show
acidic behavior in
absence of water ,they
produce ions only in
presence of water
For ex -: dry HCl gas
will not react with dry
litmus paper

20. QUIZ TIME!

21. • 1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste
due to the presence of:
a. Acetic acid
b. Citric acid.
c. Lactic acid
d. Oxalic acid
• 2. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt
along with the evolution of a gas Y which burns with a pop sound when
brought near to a burning candle. Identify the acid X and gas evolved Y.
a. X- Sulphuric acid and Y- Oxygen gas
b. X- Hydrochloric acid and Y- Oxygen gas
c. X- Sulphuric acid and Y- Hydrogen gas.
d. X- Hydrochloric acid and Y- Hydrogen gas

22. • 3. Dilute acid does not produce carbon dioxide on being treated with:
a. Marble
b. Lime.
c. Baking soda
d. Limestone
• 4. Which of the following indicators turn red in an acidic solution?
i. Phenolphthalein
ii. Litmus
iii. Turmeric
iv. Methyl orange
Choose the correct option:
(A)(i) and (ii)
(B)(ii) and (iii)
(C)Only (ii)
(D)(ii) and (iv).

23. • 5. In terms of acidic strength, which one of the following is in the correct
increasing order?
(a) Water < Acetic acid < Hydrochloric acid.
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
• 6. Brine is an
(a) aqueous solution of sodium hydroxide
(b) aqueous solution of sodium carbonate
(c) aqueous solution of sodium chloride.
(d) aqueous solution of sodium bicarbonate
• 7. Alkalis are
(a) acids, which are soluble in water
(b) acids, which are insoluble in water
(c) bases, which are insoluble in water
(d) bases, which are soluble in water.

24. 8. Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base.
(d) strong acid
9. Which of the following salt will give acidic
solution when dissolved in water?
a. NH4Cl.
b. NaCl
c. Na2CO3
d. CH3COONa

25. ANSWERS
• 1.(B)
• 2.(C)
• 3.(D)
• 4.(B)
• 5.(A)
• 6.(C)
• 7.(D)
• 8.(C)
• 9.(A)

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