1) Change 
to crackle; to roast so as to cause to crackle
• (v. i.) To crackle, as salt in roasting. • (v. t.) To roast or calcine so as to cause a crackling noise; as, to decrepitate salt.
De·crep'i·tate transitive verb [ imperfect & past participle Decrepitated ; present participle & verbal noun Decrepitating .] [ Confer French décrépiter .] To roast or calcine so as to cause a crackling noise; as, to decrepi...
[v] - undergo decrepitation 2. [v] - to roast or calcine so as to cause to crackle or until crackling stops
decrepitate 1. To heat a substance; especially, a salt, until it crackles or stops crackling, or to be heated in this way. 2. To roast or to calcine (crystals or salts) until they emit a crackling sound or until the crackling stops. 3. To make a crackling sound when roasted.
verb to roast or calcine so as to cause to crackle or until crackling stops; `decrepitate salts`