Hydrophobic
Ionic substances, for example, are generally soluble in water.
Some hydrophobic substances are soluble in water (ex.: proteins).
Lipid
Many liquids dissolve in water, and many do not. In chemistry , there is a rule "like dissolves like", so if the nature of the liquid is similar to water i.e. highly polar, it will be soluble. This rule is not infallible. Butanol is very polar, but is only about 2% soluble in water.
Because an excess of water soluble vitamins (or anything water soluble) can be easily eliminated by the kidneys, which is not true of fat soluble substances.
HYDROPHOBIC
Iodine is not soluble in water because iodine is nonpolar and water is polar. According to the "Like dissolve like" expression, nonpolar substances are soluble with nonpolar substances and polar substances are soluble with polar substances, but nonpolar substances are not soluble with polar substances.
Ionic substances, for example, are generally soluble in water.
excess water and other water soluble substances ......
water
salt
No, it is not soluble in water. To be soluble in water means that the object can dissolve in water. Examples of soluble substances include salt, sugar and so on, while insoluble substances include oil.
Different types of powder
Some hydrophobic substances are soluble in water (ex.: proteins).
Soluble substances: table salt in water, sugar in water, potassium carbonate in water, etc.Insoluble substances: table salt in acetone, silver in ethanol, barium sulfate in water.
Sorry, the question in incomplete there are no suggested test substances. However; polar covalent compounds are very soluble in water.
Blood