The equation for the ph of a substance is ph = –log[h+], where h+ is the concentration of hydrogen ions. a basic solution has a ph of 11.2. an acidic solution has a ph of 2.4. based from the given, what is the approximate difference in the concentration of hydrogen ions between the two solutions? a. 1.6*10^-9 b. 4.0*10^-3 c. 6.7*10^-1 d. 1.6*10^-11

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.