When the following chemicals are mixed, each in 1 liter of water, which would give an acidic pH at the end? Select one: O a. 1 mole of NH4 and 1 mole of NaOH O b. 1 mole of KOH and 0.5 mole of HCI O c. 1 mole of HCl and 1 mole of NH3 d. 1 mole of KOH and 1 mole of NaF