Acids, Bases and Salts — Flashcards
Gujarat Board · Class 10 · Science
26 flashcards for Acids, Bases and Salts (Gujarat Board Class 10 Science) to test yourself on key terms and facts.
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What is an acid-base indicator and give two examples?
Answer
An acid-base indicator is a dye or mixture of dyes used to indicate the presence of acids and bases through color changes. Examples: (1) Litmus - blue litmus turns red in acidic solution, red litmus t…
Why do acids not show acidic properties in the absence of water?
Answer
Acids produce H+ ions only in aqueous (water) solution. In the absence of water, acid molecules do not ionize. For example, dry HCl gas does not change the color of dry litmus paper, but HCl solution …
Write the chemical equation for the reaction when zinc reacts with dilute sulfuric acid. What gas is evolved?
Answer
Chemical equation: Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g). The gas evolved is hydrogen gas (H2). This is a characteristic reaction of metals with acids - the metal displaces hydrogen from the acid, for…
What happens when sodium hydroxide reacts with zinc metal?
Answer
Chemical equation: 2NaOH(aq) + Zn(s) → Na2ZnO2(s) + H2(g). Unlike most metals that don't react with bases, zinc reacts with NaOH solution. The products are sodium zincate (Na2ZnO2) and hydrogen gas. T…
How do metal carbonates react with acids? Write the equation and identify all products.
Answer
Metal carbonates react with acids to produce a salt, carbon dioxide gas, and water. General equation: Metal carbonate + Acid → Salt + CO2 + H2O. Example: Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO…
What is a neutralization reaction? Provide an example with a balanced equation.
Answer
A neutralization reaction is when an acid and a base react to form a salt and water. The H+ ions from the acid combine with OH- ions from the base to form water. General equation: Acid + Base → Salt +…
Why does copper oxide dissolve in hydrochloric acid? What is the color change observed?
Answer
Copper oxide (CuO) reacts with HCl acid according to: CuO(s) + 2HCl(aq) → CuCl2(aq) + H2O(l). The black copper oxide dissolves and forms copper(II) chloride solution. The color changes from black (sol…
What is the pH scale? What does a pH of 7 indicate?
Answer
The pH scale measures the concentration of hydrogen ions (H+ ions) in a solution, ranging from 0 to 14. pH stands for 'potenz' (power in German). pH of 7 indicates a neutral solution (equal concentrat…
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