Answer: Thermal Energy
Explanation:
Thermal Energy is for anything that relates to heat, so a hairdryer also uses thermal energy
(i) Hydrogen chloride gas is prepared by treating Sodium chloride with concentrated sulphuric acid. The HCl gas is passed through a drying agent to remove moisture where concentrated sulphuric acid plays the role of dehydrating agent as well.
(ii) NaCl+H2
SO4 →NaHSO 4
+HCl(g)
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Answer:
3.1 × 10⁻⁶ M
Explanation:
One water molecule can react as a base while other water molecule acts as an acid to form and hydronium ion and a hydroxide ion.
H₂O(l) + H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)
The equilibrium constant (Kw), known as the ionic product of water, has the following form:
Kw = [H₃O⁺] × [OH⁻]
The value of Kw at 25°C is 1.0 × 10⁻¹⁴.
An aqueous solution at 25°C has a hydronium ion concentration of 3.2 × 10⁻⁹ M. The hydroxide concentration is:
Kw = [H₃O⁺] × [OH⁻]
1.0 × 10⁻¹⁴ = 3.2 × 10⁻⁹ × [OH⁻]
[OH⁻] = 3.1 × 10⁻⁶ M