Question

is the hydrogen ion concentration of a pH 3.8 solution higher or lower than that of a solution with a pH of 6.2?

Answer 1

Solution a has a ph of 3.solution b has a ph of 6 solution a has- times as many hydrogen ions as solution b

Answer 2

higher

Answer 3

pH=-log[H+]

use that to figure the 2nd out

Answer 4

If you're comparing pHs in a qualitative way, just focus on the digit before the decimal point. That's the exponent of the H+ concentration:
\[[{\rm H}^+] = 10^{- {\rm pH}}\]
So a pH of 3.8 has a H+ concentration of about 10^-4, and a pH of 6.2 has a H+ concentration of about 10^-6. Which is higher?