4. a. Each of the following formulas represents a possible solid acid which might be used in this assignment. The replaceable (acidic) hydrogens are denoted by bold-face type. For each formula, give the number of moles which is one equivalent. a. Benzoic acid HC7H5O2 g. Potassium hydrogentartrate KHC4H4O6 b. Citric acid-1-water h. Sodium hydrogenoxalate-1-water H3CgH5O7(H2O) NaHC204(H20) c. Potassium hydrogenoxalate i. Sodium hydrogensulfate KHC204 NaHSO4 d. Oxalic acid-2-water H2C204(H20)2 j. Sodium hydrogentartrate-1-water NaHC4H4O6(H20) e. Potassium hydrogenphthalate KHC3H404 k. Sodium dihydrogenphosphate 5-water NaH2PO4(H20)5 f. Potassium hydrogensulfate 1. Tartaric acid KHSO4 H2C4H4O2