Q1
What taste do acids have?
ASour
BBitter
CSweet
DSalty
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 12 · Topic 2
Practice and Revision - Introduction to Acid and Base
Let us practise and revise what we learned about introduction to acid and base. Acids and bases are two important categories of substances w
Core concept
Acids taste sour, turn blue litmus paper red, and release hydrogen ions (H+) when dissolved in water, like lemon juice or vinegar.
How it works
Bases taste bitter, feel soapy, turn red litmus paper blue, and release hydroxide ions (OH-) when dissolved in water, like soap or baking soda.
Why it matters
The pH scale, ranging from 0 to 14, measures acidity or basicity, with 7 being neutral, below 7 acidic, and above 7 basic.
Key detail
Neutralisation occurs when an acid and base react together, forming salt and water, balancing their opposing properties.
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Quick notes
• Acids: sour taste, turn blue litmus red.
• Release H+ ions in water.
• Examples: lemon juice, vinegar.
• Bases: bitter taste, soapy feel.
• Turn red litmus blue, release OH- ions.
• Examples: soap, baking soda.
• pH scale: 0-14, 7 is neutral.
• Neutralisation: acid + base → salt + water.