Question

ph, acids and bases quick check
which option correctly shows the concentration of h₃o⁺ ions in pure water (ph 7)? (1 point)
○ 1.0×10⁻⁷ mol/l
○ 7 mol/l
○ 14 mol/l
○ 1.0×10⁻¹⁴ mol/l

Explanation:

Step1: Recall pH formula

The formula for pH is $pH = -\log_{10}[H_3O^+]$, where $[H_3O^+]$ is the hydronium - ion concentration.

Step2: Rearrange the formula to solve for $[H_3O^+]$

We can rewrite the formula as $[H_3O^+]=10^{-pH}$.

Step3: Substitute pH value

Given that $pH = 7$, then $[H_3O^+]=10^{-7}\text{ mol/L}$.

Answer:

A. $1.0\times 10^{-7}\text{ mol/L}$