Yes, there are many insoluble bases such as calcium carbonate.
Yes it does dissolve in tap water. It can really dissolve in any water.
It means the chemical which dissolve in water
No. It does not dissolve in water at any temperature.
When carbon dioxide (CO2) dissolves in water, it forms carbonic acid, not a base.
No, talcum powder will not dissolve in cold water. Talcum powder is insoluble in water, meaning it will not mix or dissolve in water at any temperature.
When a base dissolves in water, e.g NaOH it will form Na+ and OH-
In any means, any acid which does exist is not similar to a base as they are categorized on entirely different behaviour. However, if the word 'alkali' is replaced to the word 'acid' in this question, an alkali is a base which can dissolve well in water, every base is not well soluble in water though.
Not all the solids will dissolve in water. Different solids have different solubilities (some will dissolve more than others). The higher temperature, the more will dissolve
Yes, sodium oxide (Na2O) does dissolve in water. When sodium oxide reacts with water, it forms sodium hydroxide (NaOH), which is a strong base.
A water-soluble base is a compound that can dissolve in water to form a basic solution. Common examples include sodium hydroxide (NaOH) and potassium hydroxide (KOH). These bases dissociate into their respective ions in water, increasing the concentration of hydroxide (OH-) ions in solution.
Water can dissolve polar compounds but not apolar. By this way the formation of leuco base of indigo give a polar compound wich can be dissolve in water. This leuco base is a sodium salt, and consequently it is polar. Because I'm french my English is no perfect, so please don't insult me.
water can dissolve any substance given time. It is a universal solvent.