Question

If the concentration of h3o is 3.5 × 10-3 m, the concentration of oh- is ________ m group of answer choices A)1.0 × 10-12 B)10.5 × 10-3 C)1.0 × 10-7 D)2.9 × 10-12 3.5 × 10-11

Answer 1

In an aqueous solution, the product of the concentrations of hydronium ion (H3O+) and hydroxide ion (OH-) equals to the ion product of water, Kw. Using this relationship, the concentration of OH- when the concentration of H3O+ is 3.5 × 10^-3 M can be calculated and is approximately 2.9 × 10^-12 M. Hence, the correct answer is D) 2.9 × 10^-12 M.

Step-by-step explanation:

The concentration of hydronium ion (H3O+) and hydroxide ion (OH-) in an aqueous solution is related by the product of their concentrations being equal to the ion product of water, Kw, which is 1.0 × 10-14 at 25°C. Therefore, if we have the concentration of H3O+ as 3.5 × 10-3 M, we can calculate the concentration of OH- as follows:

[OH-] = Kw / [H3O+]

= 1.0 × 10-14 / 3.5 × 10-3

After performing this division, we find that the [OH-] equals to approximately 2.9 × 10-12 M. Hence, the correct answer is D) 2.9 × 10-12 M.

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