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Acids and Bases Overview
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Acids and Bases Overview
Acids and Bases Overview
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Question
What are the general taste characteristics of acids and bases?
Answer
Acids have a sour taste, while bases have a bitter taste.
Question
How do acids and bases affect litmus paper?
Answer
Acids change blue litmus paper to red, and bases change red litmus paper to blue.
Question
Give examples of inorganic (mineral) acids.
Answer
Examples include Hydrochloric Acid (HCl), Sulfuric Acid (H2SO4), and Nitric Acid (HNO3).
Question
What is an example of an organic acid and its common name?
Answer
Methanoic acid (HCOOH), commonly known as formic acid.
Question
Name some naturally occurring acids and their common sources.
Answer
- Vinegar contains Ethanoic (Acetic) acid - Oranges and lemons contain Citric acid - Tamarind contains Tartaric acid - Tomatoes contain Oxalic acid - Sour milk (curd) contains Lactic acid - Ant and nettle stings contain Methanoic acid (formic acid)
Question
What is the general chemical reaction when acids react with metals?
Answer
Acid + Metal → Salt + Hydrogen gas.
Question
What is the 'pop test' and what does it indicate?
Answer
The 'pop test' involves bringing a burning candle near a test tube containing hydrogen gas; the gas burns with a popping sound, confirming the presence of hydrogen gas.
Question
Can bases react with metals? If so, what is the general outcome?
Answer
Yes, bases react with certain metals to produce salt and hydrogen gas, for example: NaOH + Zn → Na2ZnO2 + H2.
Question
Why are some metals described as amphoteric, and what does this mean in acid-base reactions?
Answer
Some metals like aluminum, gallium, and indium are amphoteric, meaning they can react with both acids and bases showing both acidic and basic behavior.
Question
What happens when an acid reacts with a metal carbonate?
Answer
Acid + Metal carbonate → Salt + Carbon dioxide + Water.
Question
Provide an example of a reaction between acid and metal carbonate along with the products.
Answer
HCl + CaCO3 → CaCl2 + CO2 + H2O.
Question
How can the presence of carbon dioxide be confirmed during acid-carbonate reactions?
Answer
By passing the evolved gas through lime water; the lime water turns milky due to the formation of calcium carbonate.
Question
What happens when excess carbon dioxide passes through lime water?
Answer
Calcium carbonate formed reacts with water and excess CO2 to form soluble calcium bicarbonate: CaCO3 + CO2 + H2O → Ca(HCO3)2.
Question
What ions do acids release in solutions, and what ions do bases release?
Answer
Acids release protons (H⁺ ions), while bases release hydroxide (OH⁻ ions) in solution.