Answer :
Answer:
1000 times.
Explanation:
Hello,
In this case, since the pH is defined by:
[tex]pH=-log([H^+])[/tex]
If we want to compute the concentration of hydrogen we must write:
[tex][H^+]=10^{-pH}[/tex]
Thus, for both the backyard soils we compute:
[tex][H^+]_{pH=7}=10^{-7}=1x10^{-7}M[/tex]
[tex][H^+]_{pH=4}=10^{-4}=1x10^{-4}M[/tex]
It means that:
[tex]\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}} =\frac{1x10^{-4}M}{1x10^{-7}M}\\ \\\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}}=1000[/tex]
It means that the concentration of hydrogen at a pH of 4 is 1000 times greater than the concentration of hydrogen at a pH of 7.
Regards.