Question

What is the [H+] of a solution with a pH of 6.6? Use a scientific calculator.

Answer 1

pH is a logarithmic scale as seen below:

   pH = -log([H+])

   Please note the negative sign in front of the log function. As concentration of H+ ions increases, the pH will decrease. If pH = 6.6, then:

   pH = 6.6 = -log([H+])

   You can multiple both sides by -1. Then, to get rid of the log function, set both sides of the equation equal to 10^ as shown below:

   10^(-6.6) = [H+]

   10^(-6.6) = 2.511x10^-7,

Answer 2

8.3 × 106 - trust me, it's actually right. You can use the calculator to see if I'm correct. Punch in 8.3 × 106 = 6.6