Simple Acids
Which of the following are acids?
Milk of Magnesia
Lemon juice
Vinegar
Baking soda
Battery acid
Ammonia
Lemon juice
Vinegar
Battery acid
State the colour change on the litmus paper when tested with acid.
red
Which of the following are alkalis?
Milk of Magnesia
Lemon juice
Vinegar
Baking soda
Ammonia
Battery acid
Milk of Magnesia
Baking soda
Ammonia
What colour will alkalis turn on red litmus paper?
Blue
What is the pH value of water?
pH 7
The lower the pH, the __________ is the acid
stronger
What is the range of pH value of acids?
pH less than 7
The higher the pH value, the _______________ is the alkali
stronger
What is the range of pH value of alkalis?
pH greater than 7
When neutralisation occurs, two new substances are formed. What are they?
Salt and water
List the 3 acids commonly used in the laboratory
Hydrochloric acid
Sulphuric acid
Nitric acid
What are the properties of acids?
Corrosive
Taste sour
Acids turn blue litmus to red
What are the uses of ammonia solution?
Making fertilisers
Making cleaning liquids
What are the properties of alkalis?
Bitter
Turns red litmus paper to blue
Soapy feeling
Acids and alkalis are corrosive. Explain how it can cause harm to the individual.
They can cause severe damage to the skin, eyes and respiratory tract.
Name some acids which you have used in your everyday activity
Carbonic acid (soda drinks)
Ethanoic acid (vinegar)
citric acid (fruits)
What acid do you use to improve the flavour of your food or in cooking?
Ethanoic acid (Vinegar)
What is the common name for sodium chloride?
Soaps and detergent are used in our daily activities. Which group do they belong to? Acids or Alkalis
What are properties do they have?
Alkalis.
Soapy feeling
Bee stings are acidic and causes pain. In your opinion, what can be applied to the skin to lessen the pain.
A weak alkali
Name the process when acid reacts with alkali
Neutralization
What are the uses of nitric acid?
Making fertilizers and explosives
What is the use of calcium hydroxide?
Reduce soil acidity
A student add sodium chloride to his food so he can enjoy his meal. In your opinion, why does he add sodium chloride to his food?
To improve the flavor of his food
Acids in the mouth from food trapped between our teeth can be neutralized by using ________________.
Toothpaste