Yes i can give you some information on the PH scale,
theoretically give him some acid to change the pH scale
pH=-log(H+)
A calibrated pH meter will give the most accurate pH reading. Regular calibration ensures that the pH meter is accurately measuring the pH level of a solution.
The most acidic likely pH for a solution of a weak acid is around 3-4. This is because weak acids only partially ionize in water, resulting in a lower concentration of H+ ions compared to strong acids.
pOH = 14 - pH 5 = 14 - pH 9 = pH
phony
Yes, they have mastered some specialized field of knowledge and have contributed new information to that field.
An accurate measurement is made with a pH-meter; pH-papers make only approximative determination.
If someone gave out your number, then you can explain the mistake to CraigsList if they call. More likely, someone is just pretending to be from CraigsList to get some account information from you. Bottom line, some you don't truly know has called you. Say "wrong number" and hang up.
The optimum pH for what? Please provide more context so I can give you an accurate answer.
phoney :-)
phony