Question

- ACIDS AND BASES Identifying the major species in weak acid or weak base The preparations of two aqueous solutions are described in the table below. For each solution, write the chemical formulas of the major species present at equilibrium. You can leave out water itself Write the chemical formulas of the species that will act as acids in the 'acids' row, the formulas of the species that will act as bases in the bases' row, and the formulas of the species that will act as neither acids nor bases in the other row. You will find it useful to keep in mind that NH, is a weak base. acids: 0 Den 1.4 mol of HBr is added to 1.0 L of a 1.4 MNH, solution. bases: 0 5 ? other: DO 0.4 mol of NaOH is added to 1.0 L of a solution that is 0.8 Min both NH, and NH,Br. acids: 0 bases: 0 other: 0

Answer 1

PART 1:

• Acids : NH₄⁺
• other : Br ^-

^{Note : No bases left over here...}

PART 2:

NaOH + NH₄^{+ _{------------>}} H₂O + NH₃ + Na⁺

NaOH : 0.4 mol

NH₄^{+ _:} 0.8 mol

• Acids : NH₄⁺
• bases : NH₃
• other : Na⁺, Br ^-