Answer to Question #325521 in Organic Chemistry for chemistry

Question

In an aqueous solution at 25°C, if [H₃O⁺] = 2.4 × 10⁻⁴ M, then [OH⁻] is:

Answer 1

Solution:

K_w = [H₃O⁺] × [OH⁻]

The value of K_w in any aqueous solution at 25°C is 1.0×10⁻¹⁴ 

Therefore,

[OH⁻] = K_w / [H₃O⁺]

[OH⁻] = (1.0×10⁻¹⁴ ) / (2.4×10⁻⁴) = 4.2×10⁻¹¹

[OH⁻] = 4.2×10⁻¹¹ M

Answer: [OH⁻] is 4.2×10⁻¹¹ M