Chemistry class

1. EVERYDAY ACIDS AND BASES

2.  Key concept: Systems
 Related concepts: Consequences, Evidence
 Global context: Globalisation and Sustainability
 Statement Of Inquiry: Human impact on the
environmental systems leads to consequences
• Introduction
• Acids
• Bases
• pH scale
• Indicators-Natural and Synthetic
• Lab based on Indicator.
• How to make natural indicator in lab?
• Neutralization
• Applications of neutralization reaction.
 Contents we learnt:-

3. SUMMARISE

4. SUMMARISE

5. https://www.youtube.com/watch?v=8NBbKHwTTpw
SUMMARISE
https://www.youtube.com/watch?v=LFQdD0e3L9I Have more fun

6. NEUTRALIZATION
 When acid and base are
mixed together they
make a neutral solution.
This is called
neutralization.
 pH is 7
 When a base is added to
an acid in just the right
amount to make the pH
about 7, we say it has
neutralized the acid.
SUMMARISE

7. APPLICATIONS OF NEUTRALIZATION
 A common treatment for a
bee sting is to soothe it with
calamine lotion.
 Antacid tablets are used to
neutralize acid in the
stomach.
 Toothpaste is alkaline and
helps to neutralize acid in the
mouth.
 Hair conditioner is acid and
neutralizes the alkalinity left
in the hair by most shampoo.
 A neutralization reaction can
be used to change the pH of
lakes and soils by adding
limestone in it.

8. ACID PRESENT IN FOOD
 Grapes- Tartaric acid
 Milk- Lactic acid
 Lemons - Citric acid
 Vinegar- Acetic acid
 Tomatoes,banana,berries,apple-Malic acid
 Leafy green vegetables– Oxalic acid
 Citrus fruits, berries– Ascorbic acid (Vitamin C)

9. AIR POLLUTION AND ACID RAIN
 Fuels such as coal and oil contain sulfur. When fuel
is burnt, the sulfur takes part in a chemical reaction
with oxygen and sulfur dioxide is produced. This
gas reacts with water vapour and oxygen to form
sulfuric acid.
 Oxides of nitrogen are produced in the exhaust
gases of cars and trucks form nitric acid.
 This may fall to the ground in raindrops and make
acid rain that is more harmful.
https://www.youtube.com/watch?v=dmgLESI4GGU

10. ACID RAIN
 When sulfur dioxide and
nitrogen oxide dissolve in the
moisture in the air, they form
sulfuric acid and nitric acids.
 This is known as acid rain.
 If this rain falls on forests, it can
kill the trees over time.
 It also can cause lakes to
become acid, which affects the
fish and plant life in the lakes.
 When acid rain falls on cities,
anything made of marble will be
slowly eaten away.

11. THE EFFECT OF ACID RAIN
 Acid rain can have harmful effects on plants,
aquatic animals and infrastructure.
 It decreases pH of soil which directly affects the
growth of trees and plants.
https://www.livescience.com/630
65-acid-rain.html

12.  Stand up to work, so that if
you spill something it does
not spill onto you.
 Wear safety glasses, so
nothing gets into your eyes.
 Wear gloves to protect the
skin.
 Wear labcoat
 Tie your hair when you are
working in lab.
SAFETY PRECAUTIONS TO BE TAKEN WHILE
HANDLING CHEMICALS: