Question

Calculate pH of 6ml of 3M HNO3 diluted to 18 litres of water

Answer 1

(HNO3) = 3M x (6 mL/18,000 mL) = ?

Then pH = -log(HNO3); however, be careful that this concentration is so small that you must include (H^+) from the ionization of water. Post your work if you get stuck.