soap
A base has a slippery soapy feel.
This is not universally true, but Bases tend to have a 'soapy' feel. NB: I would not recommend your plunging you hands into every bucket of base you see, however ... some can burn.
The definition of a compound word is a word that is basically two words put together. Here are some examples of compound words:SnowmanWatermelonSailboatBasketballNow that you know this, soapy is not a compound word. Soapy does not have two words within it.
After washing the dishes, there was a soapy residue left in the sink.
Soapy water is Alkaline so it is a base.
Yes, it is not neutral; more frequently basic.
no, its adjective
The mineral with a soapy feel is called talc. Talc has a greasy or soapy texture and is often used in powders and cosmetic products.
SOAPY
I just rub them over with a warm soapy cloth.
Soapy is an adjective. If you are looking for a more technical way to describe something which can act as a soap, you could say it is a surfactant.
Baking soda typically has a bitter taste, can feel soapy when mixed with water, and neutralizes acids due to its alkaline properties.