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Question

# The pH values of two acids A and B are $1$ and $5$ respectively. Which is the strong acid?

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Solution

## The pH scaleThe pH scale is a simple way to represent the acidity and alkalinity of aqueous solutions.The hydrogen ion $\left({\mathrm{H}}^{+}\left(\mathrm{aq}\right)\right)$ index is referred to as pH. As a result, acid strength is determined by the concentration of hydrogen ions.The pH is also calculated using the negative logarithm (to the base $10$) of the hydrogen ion concentration given in moles per liter.$\mathrm{pH}=-{\mathrm{log}}_{10}\left[{\mathrm{H}}^{+}\left(\mathrm{aq}\right)\right]$pH valueThe condition of pure water in alkalinity, i.e., the condition of exact neutrality, is represented by the number $7$ on the pH scale. The number of hydrogen ion $\left({\mathrm{H}}^{+}\left(\mathrm{aq}\right)\right)$and hydroxide ion $\left({\mathrm{OH}}^{-}\left(\mathrm{aq}\right)\right)$ in pure water is equal.${\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{aq}\right)⇌{\mathrm{H}}^{+}\left(\mathrm{aq}\right)+{\mathrm{OH}}^{-}\left(\mathrm{aq}\right)\left[\mathrm{at}25°\mathrm{C}\right]$pH levels below $7$ indicate acidity, whereas pH values over $7$ indicate basicity.The pH values of two acids, A and B, are $\mathbf{1}$ and $\mathbf{5}$:Acid A has a low pH value that is $1$. In comparison to B, which has a pH of $5$, A is a strong acid.

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