Answer:
See explanation
Step-by-step explanation:
Salts are produced from the reaction of an acid and a base. In general ...
Acid + Base => Salt + Weak Electrolyte
Acids from the 'Arrhenius Definition' contain an 'ionizable' hydrogen (-H). Such as, HCl, HBr, HI, HNO₃, HClO₄, HF, etc.
Bases from the 'Arrhenius Definition' contain an 'ionizable' hydroxide (-OH). Such as, LiOH, NaOH, KOH, CsOH, Ca(OH)₂, etc.
When the acid and base react, they proceed by what is known as a 'Double Replacement Reaction' or 'Metathesis Reaction'. In the process, the ions of the reactant compounds exchange positions such that a 'Driving Force' compound is formed on the product side. The Driving Force compound is always on the product side of the equation and is a compound that takes one of three forms => A precipitating salt, a compound of a weak acid or weak base (weaker than the starting acid or base) or gas decomposition product (~ vinegar + backing soda rxn => CO₂ gas).
For your problem, split the compound into cations and anions. You can usually tell which is which by using this format on formulas like those listed in your question => reading formula from left to right, place an imaginary line after the 1st metal => this metal will be the cation & the remaining formula will be the anion.
KBr => K | Br => K (Potassium) is the cation (K⁺) and Br (Bromide) is the anion (Br⁻)
KBr => K⁺ + Br⁻
Now. Apply this rule => Add 'H' to anion => HBr, then add 'OH' to cation => KOH.
HBr is the acid and KOH is the base. Therefore ...
Acid + Base => Salt + Wk Electrolyte
HBr + KOH => KBr + H₂O (note how ions of reactants exchange places to form products).
So, KBr comes from the reaction of acid HBr and base KOH.
HBr + KOH => KBr + H₂O
To determine the acid and base origins of LiCl and NaF, use the same logic. Hope this helps. Doc :-)