Shert answer type questions (1)
1. What are indicators? Name two acid base indicators.
2. Which of the following acids are weak? (a) Formic acid (b) Nitric acid.
3. You are given a solution of a base. What is the effect of it on the following:
(a) Red litmus
(b) Blue litmus
(c) China rose indicator
(d) Turmeric indicator
4. What will happen
(a) when a drop of hydrochloric acid is added to blue litmus?
(b) when a drop of dilute sulphuric acid is added to china rose indicator?
5. An acidic substance is mixed with an equivalent amount of a basic substance.
(a) What is the reaction called?
(b) What product is formed?
6. What is pH?
Answers
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Explanation:
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Answer:
1-Perhaps the best-known pH indicator is litmus. Thymol Blue, Phenol Red, and Methyl Orange are all common acid-base indicators. Red cabbage can also be used as an acid-base indicator.
2-Weak acid Weak acid ionises only partially in aqueous solution and thus it produces ions as well as molecules, e.g., acetic acid, carbonic acid.
...
Strong AcidWeak AcidHydrochloric acid Nitric acid Sulphuric acidCitric acid Acetic acid Formic acid
3-Explanation: base=blue acidic=red remember it like base=blue b is base b is blue and for acidic an apple is red and acidic a in acidic and a in apple.
a-The Red Litmus turns into Blue Indicating It's a Base.
b-The main use of litmus is to test whether a solution is acidic or basic. Light Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple.
c-China rose turns acidic solution to dark pink or magenta color, turns basic solution to green color and has no change in color for neutral solutions. Explanation: China rose is a natural indicator and is used to detect the nature of solution to be acidic or basic.
d-Turmeric as an indicator identifies basic solution only. Its colour changes to red when come in contact with basic solution. It colour does not change in acidic or neutral solution. Litmus is extracted from lichen plants.
4-(a)- When a drop of hydrochloric acid is added to blue litmus it will turn red in colour.
(b) - Dilute sulphuric acid will turn the color of China rose indicator to red or dark pink. China Rose is actually an acid base indicator, which reacts with acid to change its color to Red
5- When an acid reacts with a base the reaction is called neutralization. The pH of the neutralized substance formed depends on the acidic and basic strength of the reactants.
a- The reaction is called neutralisation reaction.
b- When an acid reacts with a base the reaction is called neutralization. The pH of the neutralized substance formed depends on the acidic and basic strength of the reactants. b.) By the process of neutralisation salt and water is formed.
C- When an acid reacts with a base the reaction is called neutralization. The pH of the neutralized substance formed depends on the acidic and basic strength of the reactants. b.) By the process of neutralisation salt and water is formed.
Explanation:
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