calculate the pH of pure water. (recall that pH= -log[H+])
Hopefully the following site will help you:
http://en.wikipedia.org/wiki/PH
To calculate the pH of pure water, we need to use the equation pH = -log[H+], where [H+] represents the concentration of hydrogen ions in the solution. In pure water, the concentration of hydrogen ions is 1.0 x 10^-7 mol/L.
Now, let's calculate the pH:
pH = -log(1.0 x 10^-7)
To find the value using a calculator, use the negative logarithm function, often denoted as "log" or "ln" depending on the calculator. Type in 1.0 x 10^-7 and then apply the negative logarithm function to get the final pH value.
Alternatively, you can use the logarithm identity log(a * b) = log(a) + log(b) to simplify the calculation:
pH = -log(1.0) - log(10^-7)
Since log(1) is equal to 0, we have:
pH = 0 - (-7)
which simplifies to:
pH = 7
So, the pH of pure water is 7.