Question

PELOU (ONLOPUTUL ULU TULUPULLI 2. Answer the following questions about Part 2. a. Consider the crystallization of sodium acetate in Part 2. Write out a reaction for this process. Is this process enthalpy driven or entropy driven? How do you know? b. In Part 2, you had to heat the sodium acetate solution in order to dissolve all of the salt. Consider that this involved an amount of heat, q, going into the system from the surroundings. What is the system? What are the surroundings? c. In Part 2, you cooled the sodium acetate solution back to room temperature and then added a grain of solid sodium acetate. What happened? What happened to the temperature of the vial? In this case, what is the sign on q for the system? For the surroundings? Results and Conclusion a one paragraph (3-5 sentences) statement that provides the scientific objective of the lab, f summary of the procedure, and report the major results.

Answer 1

A) The crystallization is always accompanied by decrease in entropy by but is an enthalpy driven reaction because it is exothermic in nature .Matter in any form have energy(kinetic) stored in the form of motion of its constituent particles(atoms or molecules). Whenever crystallization (or liquification)takes place it involves reduction in motion of these constituent particles which is given out in form of heat thus called an exothermic change.

B) the system is the solution of sodium acetate and rest all things are sorroundings which include even you , the burner or heating mantle you are using etc.

C)When sodium acetate, CH3–COO– Na+, is dissolved in a little water, the oppositely charged ions dissociate. If left undisturbed and cooled, the ions do not form crystals and the sodium acetate remains a liquid, far below its melting point. If disturbed, or a tiny sodium acetate crystal is introduced into the solution, the oppositely charged ions (CH3–COO– and Na+) form a solid crytal structure quickly. The process is exothermic, releasing heat energy, which explains why this process is commonly referred to as "hot ice". THE PROCESS OF ADDING THE GRAIN OF THE SOLID IS CALLED AS SEEDING WHICH HELPS TO ACHIEVE SOLID LIQUID EQUILLIBRIUM FASTER FROM THE METASTABLE EQUILLIBRIUM WHICH HAS BEEN FORMED DUE TO COOLING AND HELPS TO FORM THE CRYSTALS FASTER.

THE SIGN OF q FOR SYSTEM IS NEGATIVE WHILE FOR THE SORROUNDING IS POSITIVE.