Calculate either [H3O+] or [OH-] for each solution. solution A. [OH-] = 1.39×10^7 M; [H3O+] =

solution B. [H3O+] = 9.87×10^-9 M; [OH-] =

solution C. [H3O+] = 7.47×10^-4 M; [OH-] =

which of these solutions are basic at 25°C?

A. [OH-] = 1.39×10^-7 M
B. [H3O+] = 9.87×10^-9 M
C. [H3O+] =7.47×10^-4 M

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.