Why do we use Soap solution to test hydrogen gas to get the pop sound ? Plz elp !!
Class 10 chapter 2 chemistry
Answers
Aim
To study the properties of acids (dil. HCl) and bases (dil. NaOH) by their reaction with
Litmus solution (blue/red)
Zinc metal
Solid sodium carbonate
Materials Required
Test tubes, test tube stand, test tube holder, cork, droppers, boiling tube, match-box, burner, flat bottom flask, thistle funnel, beaker, litmus solution/paper (red and blue), glass rod, zinc granules, freshly prepared lime water, solid sodium carbonate and dil. HCl.
Theory
Acid
An acid is a substance which furnishes H+ ions when it is dissolved in water like HCl. Acids turn blue litmus red and do not affect red litmus.
On reacting with zinc metal, HCl forms a salt, zinc chloride (ZnCl2) and hydrogen gas (H2) is liberated.
CBSE Class 10 Science Lab Manual – Properties of Acids and Bases 1
Hydrogen gas burns in air with a blue flame and produces a pop sound.
CBSE Class 10 Science Lab Manual – Properties of Acids and Bases 2
HCl reacts with sodium carbonate (aqueous/solid) to liberate carbon dioxide (CO2 ) which turns lime water milky due to the formation of calcium carbonate. When excess of CO2 is passed through the solution, the milkiness disappears.
CBSE Class 10 Science Lab Manual – Properties of Acids and Bases 3
Answer:
Soap solution can easily form bubbles of Hydrogen gas so Soap solution has been used
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