An aqueous solution at 25 c has a OH- concentration of . Calculate the concentration. Be sure your answer has the correct number of significant digits.

Full Question:

An aqueous solution at 25 C has a OH- concentration of 2.5x10-4M . Calculate the H3O+ concentration. Be sure your answer has the correct number of significant digits.

4×10−9M

Explanation:

From the question;

[OH−] = 2.5x10-4M

[H3O+] = ?

The relationship between both parameters is given as;

Kw = [H3O+] * [OH−]

where k self-ionization constant of water, Kw = 1×10−14, which has no units.

Upon solving for [H3O+];

[H3O+] = Kw / [OH−]

Kw = 1×10−14

[H3O+]  = (1×10−14 ) / 2.5x10-4

[H3O+]  = 0.4 * 10-10

[H3O+]   = 4×10−9M

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.