MHT CET2009ChemistryIonic Equilibrium
The number of hydroxyl ions in 10 ~cm ³ of 0.2 M HCl solution is
Options
- A5 10⁻¹⁴
- B3 10⁹
- C3 10¹²
- D5 10⁻¹²
Correct answer
C. 3 10¹²
Step-by-step solution
[ H ⁺ ]=0.2 M (given, HCl =0.2 M ) [ H ⁺ ] [ OH ⁻ ]=10⁻¹⁴ [ OH ⁻ ]= 10⁻¹⁴ 0.2 =5 10⁻¹⁴ M Concentration of hydroxyl ions in 0.2 M HCl =5 10⁻¹⁴ M The number of moles of hydroxyl ions =5 10⁻¹⁴ 1000 The number of OH ⁻ in 10 ~cm ³ array l = 5 10⁻¹⁴ 1000 6.023 10²³ 10 =3 10¹² array