Which method(s) below can be used to produce a formate (HCOO) buffer with a pH of 3.00? The K, for formic acid (HCOOH) is 2 x 104 at 25C. (You do not need a calculator to answer this question). I. mix equal volumes of 0.50 M HCOONa and 0.50 M HCOOH II. mix a calculated lesser volume of 0.50 M HCOONa with a calculated greater volume of 0.50 M HCOOH III. mix a calculated greater volume of 0.50 M HCOONa with a calculated lesser volume of 0.50 M HCOOH IV. mix a calculated volume of HCl(aq) to a calculated volume of 0.50 M NaHCOO V. mix a calculated volume of NaOH(aq) to a calculated volume of 0.50 M HCOOH O II, IV, and V O III, IV, and V O III and V OIII and IV OI only O II and V O II and IV