Question

the equation for the ph of a substance is ph = - logh⁺, where h⁺ is the concentration of hydrogen ions. what is the approximate ph of a solution if the concentration of hydrogen ions is 5.0 × 10⁻⁴ moles per liter? 3.0 3.6 3.3 2.7

Explanation:

Step1: Substitute the value of [H⁺]

Given [H⁺]=5.0×10⁻⁴, and pH = -log[H⁺], so pH=-log(5.0×10⁻⁴).

Step2: Use logarithm properties

We know that log(ab)=log(a)+log(b), so log(5.0×10⁻⁴)=log(5.0)+log(10⁻⁴). Since log(10⁻⁴)= - 4 and log(5.0)≈0.7, then log(5.0×10⁻⁴)≈0.7 - 4=-3.3.

Step3: Calculate pH

pH=-log(5.0×10⁻⁴), so pH≈ - (-3.3)=3.3.

Answer:

3.3