Questions: According to Arrhenius, an acid and a base will react to give a salt plus water.

Determine the product of an acid-base reaction according to Arrhenius.

Understanding Arrhenius definition

According to Arrhenius, an acid is a substance that increases the concentration of hydrogen ions (\( \text{H}^+ \)) in aqueous solution, while a base increases the concentration of hydroxide ions (\( \text{OH}^- \)).

Reaction between acid and base

When an Arrhenius acid reacts with an Arrhenius base, the hydrogen ions from the acid combine with the hydroxide ions from the base to form water (\( \text{H}_2\text{O} \)). The remaining ions form a salt.

Conclusion

Therefore, according to Arrhenius, an acid and a base will react to give a salt plus water.

\(\boxed{\text{a salt plus water}}\)

The answer is \(\boxed{\text{a salt plus water}}\).