Verified answer

µ = 10^-6

1µL = 1*10^-6L

15µL = 15*10^-6 = 1.5*10^-5L

1*1.5*10^-5 = 1.5*10^-5mols of NaCl

1.5*10^-5 / 1 /1000 = 0.015M of NaCl

My wager, 6 to 7. Sea water includes many compounds, sodium chloride is just one in each of them. If u would desire to stimulate sea water, uncomplicated NaCl water probable wont do. Sea water has pH above 7, yet NaCl soln ought to have pH under 7. for the reason that hydrochloric acid is a sturdy acid (chloride is an extremely vulnerable base) and sodium is an extremely vulnerable acid, so pH value for NaCl water with out contacting air must be 7. even however, carbon dioxide interior the air will make the soln acidic. so, 6-7 must be fairly genuine looking