There are two main kinds of properties: chemical and physical.
Chemical properties, like the name suggests, have to be observed by changing the chemical composition.
That leaves <u>physical properties.</u> They can be measured without any chemical composition changes.
Some examples include: color, odor, mass, density, and volume. All can be measured with just the senses or measuring tools and no composition alterations are needed.
In dilution we add distilled water to decrease the concentration of required sample from high concentration to lower concentration The law used for dilution: M₁V₁]Before dilution = M₂V₂] After dilution M₁ = 1.5 M V₁ = ? M₂ = 0.3 M V₂ = 500 ml 1.5 * V₁ = 0.3 * 500 ml so V₁ = 100 ml and it completed to 500 ml using 400 ml deionized water