What is the oxidation number of Na in Na2SO4 What is the oxidation number of H in CaH2 What is the oxidation number of O in KClO4 What is the oxidation number of O in Na2Cr2O7 Is this a redox reaction?  HCl (aq) + NH3 (aq) → NH4Cl (aq)

what is coefficient of water and where does it appear when the following equation is balanced?

A 1.4350-gram of KHP (actual formula = KHC8H4O4; molar mass = 204.22 g/mol) was dissolved in 50.00 mL of deionized water. The resulting solution was titrated with NaOH solution of unknown concentration. If 32.85 mL of the NaOH solution was required to reach the equivalent point, what was the molar concentration of the NaOH solution? The acid-base reaction is as follows:                 KHC8H4O4(aq)  +  NaOH(aq)  -->   NaKC8H4O4(aq)  +  H2O(l)          (A) 0.1405 M           (B) 0.2139 M           (C) 0.08481 M           (D) 7.0267 x 10–3 M

Identify each element(s) in the following reaction that is not balanced.  6 KOH (aq)  +  2 H3PO4 (aq)  →→3PO4 (aq)  + 3 H2O (l)    K   H   P   All elements are balanced.   O