10. Name the indicator that gives red colour with
soap
F. Short-answer questions
1. Write names and formulae of three mineral acids.
2. Name the acid used in
a) car batteries
b) antbite
3. List any four properties of bases.
4. What is acid rain?
5. What is milk of magnesia?
6. What are indicators? Name some natural and
man-made indicators?
Answers
Answer:
10)Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue.
Explanation:
1)three mineral acid are as follows :
sulphuric acid (H2SO4)
Hydrochloric acid (HCL)
Nitric acid (HNO3)
2)sulphuric acid molecules - car battery
formic acid- antbite
3)Chemical Properties of Bases
•Bases change the colour of litmus from red to blue.
•They are bitter in taste.
•Bases lose their basicity when mixed with acids.
•Bases react with acids to form salt and water. ...
4)Acid rain, or acid deposition, is a broad term that includes any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms. This can include rain, snow, fog, hail or even dust that is acidic.
5)milk of magnesia is a white suspension of hydrated magnesium carbonate in water, used as an antacid or laxative..
6)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.
Both naturally occurring indicators and synthetic indicators are weak organic acids or bases. For example, a common synthetic indicator used in most chemistry laboratories is phenolphthalein (Figure below). Structure of Phenolphthalein. ... In the acidic range, chemistry students may use methyl orange.
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Answer:
4) Rain containing excess amount of acids is called acid rain