Chemical properties of a base increases the concentration of hydroxide ions when added to water, feels slippery, and forms salt when added to an acid. increases the concentration of hydrogen ions when added to water, reacts with metal to form hydrogen gas, and forms salt when added to an acid. increases the concentration of hydroxide ions when added to water, reacts with many oils and fats, and forms salt when added to an acid. increases the concentration of hydroxide ions when added to water, reacts with many oils and fats, and tastes bitter.

Hello!

Chemical properties of a base include: Increases the concentration of hydroxide ions when added to water, feels slippery, and forms salt when added to an acid. 

Considering a base BOH, the reaction that increases the concentration of hydroxide ions when added to water is the following:

BOH(s) ⇄ B⁺(aq) + OH⁻ (aq)

They feel slippery because they attack the oils and fats in the skin, reacting to make soap:

RCOOR    +    BOH → RCOOB + ROH

Oils&Fats                       Soap

They form salts when added to acids (HA) by the following reaction:

HA + BOH → AB  + H₂O
                       Salt