Question

why should we remove the saturated solution from the undissolved solute before suspending the crystal in the solution

explain why increasing the number of carbons of an alcohol decrease the solubility

compare and contrast polymorph and allotrope

a metal nitrate as nitrogen ar each corner and a metal ar each edge. what is the empirical formula

Note: Please type the answer

Answer 1

The undissolved solute may contain the impurities which are undissolved in water. Hence, to add a new salt it is better to remove the salt undissolved before adding crystal.

The increasing number of carbons in a homologous series of alcohol decreases the solubility of alcohol in water. This is because of increasing the London-dispersion forces in the higher alcohols increases the non-polarity.

There are 8 corners and each corner is shared by 8 neighboring atoms. Hence the nitrate contribution in the unit cell is 1/8.

Total nitrates in unit cell are - 8*1/8 = 1

Similarly, the number of edges is 6. Each edge is shared by two atoms. Hence the number of metal atoms present are 6*1/2 = 3

Thus - The empirical formula is M(NO₃)₃