<prompt> What will happen to DNA if salt is added to it?Increase melting point TmDecrease TmNot affect TmMelting lead to denaturation of DNA  <response>: This makes the DNA less hydrophilic less soluble in water. Ethanol has a lower dielectric constant than water so it;s used to promote ionic bonds between the Na from the salt and the PO3- from the DNA backbone causing the DNA to precipitate. 