Very Easy
Turns red litmus paper blue.
What is base?
reacts with acid to form their respective salts, water and carbon dioxide.
Metal carbonate
How to make turmeric paper
•Take a tablespoonful of turmeric powder. Add a little amount of alcohol and make a paste.
•Spread the turmeric paste (or filter paper) and let it dry.
•The yellow paper thus obtained, is the turmeric paper. Cut thin strips of the turmeric paper. Cut thin strips of turmeric paper. We can use these this strips of turmeric paper as an indicator.
base
No effect on yellow turmeric paper
Acid and neutral substances
What are indicators?
Special substance used to test whether a substance is acidic or basic in nature
Write an example of Neutralisation reaction's example on board (equation)
dilute hydrochloric acid and dilute sodium hydroxide forms sodium chloride plus water plus heat.
How to prepare china rose indicator
Collect petal of china rose flower and place them in a beaker. Add some water and keep the petals immersed in the water until the color of the water becomes light pink. Filter the solution, the light pink filtrate obtained is the china rose indicator.
Turns red litmus paper blue
Conduct electric current
Acid and base
Spinach, tomatoes and guavas
Oxalic acid
What is indigestion?
when we eat very spicy food, our stomach produces a large amount of hydrochloric acid which leads to the acidity of stomach. This is called indigestion
How does soil become acidic and how can it be treated
Excessive use of chemical fertilisers makes the soil acidic, it can be treated with bases like quicklime (calcium oxide) or slaked lime (calcium hydroxide). The bases neutralise the excess acids present in the soil and hence soil become neutral.
React with metals to produce Hydrogen gas.
acid
Corrosive in nature because it can cause severe burns to the skin.
Mineral acids
Have high melting and boiling points
salts
All uses of bases
Sodium hydroxide (NaOH) – Used in manufacturing of soaps, paper, textiles etc..
Ammonium hydroxide (NH4OH) – Used in manufacturing of fertilisers, plastics, dyes, ink removal and window cleaners.
Calcium hydroxide [Ca(OH)2] – Used for whitewashing of buildings, manufacturing of bleaching powder and neutralization of acidity of soil.
Name four properties of salts
1.Exist in solid state.
2.High melting and boiling points.
3.Most of them are soluble in water.
4.They are good conductors of electricity
Neither acidic nor basic
neutral substances
also known as laboratory acids
mineral acids
What are bases
Substances (like baking soda) which taste bitter and have soapy touch.
Bases that dissolve in water
Alkalis
Name all of the properties of acids
1.Sour in taste
2.Soluble in water
3.All acidic solutions conduct electricity
4.They turn blue litmus red
5.They are corrosive in nature and they are stored in glass containers instead of metal containers.
6.Most of the acids react with metal to form hydrogen gas and their respective salts.
Acid + Metal Salt + H2
7.Most of the acids react with metal carbonate to form their respective salts, water and carbon dioxide.
Acid + Metal carbonate Salt + CO2 ( ) + H2O
8. Acids react with bases to form salts and water.