EXPERIMENT 7

EXPERIMENT 7 - The mat hemat ical equat ion for t he fr...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
The mathematical equation for the freezing point depression is: solute   denotes the change in temperature. i   is the van’t Hoff (number of ions in the solution). K f   is the freezing point. m s olute is the molality of the solute EXPERIMENT 7: Freezing Point Depression to Determine Molar Mass Josué J. Negron “I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community.” Signature: Josué Negron 17:28:23 Lab Partner: Ahmed Ismail Chemistry 1310- H1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
  EXPERIMENT 7: Freezing Point Depression to Determine Molar Mass                                 N e g r o n  | 2 Discussion Introduction / Objective The objective of this experiment was to determine the molecular weight of an unknown compound by freezing point depression and calculations using the equation. This experiment introduced the concept of the van’t Hoff expression and proved the accuracy of the freezing point depression equations. 1 In addition, the cooling curve was introduce to accurately determine compounds’ freezing points and used to observe super cooling effects. Summary In this experiment, the main objectives were fulfilled by testing the fundamentals of the van’t Hoff expression seeing the relationship of the cooling curve to the freezing point of a compound. In the first part of the experiment, the freezing point of water was calculated experimentally, both as a practice run before 1  Bottomley, Leigh; Cox, Charles, Chemistry 1310: General Chemistry: Lab Manual, 2009. p. 63
Background image of page 2
  EXPERIMENT 7: Freezing Point Depression to Determine Molar Mass                                 N e g r o n  | 3 doing the procedure with the unknown and to see the actual freezing point of water. The temperatures were taken by the Vanier temperature probe set to record answers every 15 seconds. After the temperatures were recorded, the known was tested. An ice bath of salt water and ice was used to decrease the temperature of the unknown rapidly, thus reaching its’ freezing point within 480 seconds. Two trials were ran so that the average could be taken later for a precise measurement. The mass of the water and unknown were taken; with that information plugged into
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

EXPERIMENT 7 - The mat hemat ical equat ion for t he fr...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online