Question

question 9
4 points
an acid with a ph of 6 has ______ hydrogen ions than pure water.
100 - fold more
100 - fold fewer
10 - fold fewer
10 - fold more
clear selection

Explanation:

The pH scale is logarithmic, where each unit change in pH represents a 10 - fold change in hydrogen ion concentration ($[\text{H}^+]$). The formula for pH is $\text{pH}=-\log_{10}[\text{H}^+]$. Pure water has a pH of 7. For a solution with pH = 6, the hydrogen ion concentration $[\text{H}^+]_1 = 10^{-6}\ \text{M}$, and for pure water (pH = 7), $[\text{H}^+]_2=10^{-7}\ \text{M}$. To find the ratio of the two concentrations, we calculate $\frac{[\text{H}^+]_1}{[\text{H}^+]_2}=\frac{10^{-6}}{10^{-7}} = 10$. So an acid with pH 6 has 10 - fold more hydrogen ions than pure water.

Answer:

D. 10 - fold more