Saltpetre (potassium nitrate) is used as a fertiliser. It occurs naturally, mixed with soil, in many countries. Potassium nitrate is very soluble in hot water, but not very soluble in cold water. How can we obtain pure potassium nitrate that is free of soil? Pls help me id be grateful​

answer; /// i do believe that the correct answer is (a) boiling

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

56 moles of   lieter in chemistry