What is the total mass of kno3 that must be dissolved in 50. grams of h2o at 60.°c to make a saturated solution?
(1) 32 g (3) 64 g
(2) 53 g (4) 106 g

53g

Explanation:

First we plot the solubility graph for KNO3 as shown in the image attached. From the graph, we see that the solubility of KNO3 per 100g of solution is 106g.

Hence if 106g of KNO3 dissolves in 100g

Xg of KNO3 dissolves in 50g

50×106/100 = 53g of KNO3

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.