[Endeavor]

"Use the Bronsted-Lowry and Lewis definitions of acids and bases to identify each reactant as an acid or a base."
a. KOH + HBr <---------> KBr + H₂O
b. HCl + H₂O <---------> Cl ^- + H₃O⁺

I don't understand how to solve this problem.

[Borek]

Start with definitions - write down what Bronsted-Lowry acid and base are and what Lewis acid and base are.

[Donaldson Tan]

bronsted acid: proton donor
bronsted base: proton acceptor

lewis acid: electron pair acceptor
lewis base: electron pair donor

for (a), KOH accepts a proton to form water, so it's a bronsted base. The H+ proton accepts an electron pair from OH- to form water, so H+ from HBr acts as a lewis acid. Hope this helps.