If it takes 20 mL of 0.35 M H₂SO₄ to neutralize 50 mL of NaOH solution, what is the concentration of the NaOH solution? A 0.21 M
B 0.07 M
C 0.14 M
D 0.28 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.