At certain temperature the proton concentration of pure water is `2.5 xx 10^(-7) M`. What is the hydroxyl ion concentration ? What is the magnitude of `K_w` ?

Explanation

To solve the problem step by step, we can follow these calculations:

### Step 1: Understand the relationship between proton concentration and hydroxyl ion concentration in pure water.
In pure water, the concentration of hydrogen ions \([H^+]\) is equal to the concentration of hydroxide ions \([OH^-]\). This is due to the self-ionization of water, which can be represented as:
\[ H_2O \rightleftharpoons H^+ + OH^- \]

### Step 2: Given the proton concentration.
The problem states that the proton concentration \([H^+]\) of pure water is:
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