JEE Main Chemistry question
Approximate pH of 0.10 M aqueous H₂S solution having K₁ and K₂ for H₂S at 25°C 10⁻⁷ and 10⁻¹³ respectively, is:
Answer: (A)
Solution
[H⁺]≈√(K₁×C)=√(10⁻⁸)=10⁻⁴; pH=4.
Approximate pH of 0.10 M aqueous H₂S solution having K₁ and K₂ for H₂S at 25°C 10⁻⁷ and 10⁻¹³ respectively, is:
[H⁺]≈√(K₁×C)=√(10⁻⁸)=10⁻⁴; pH=4.