# lab 7 - 4.3 Lab # 7 Freezing Point Depression QuickTime and...

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4.3 Lab # 7 Freezing Point Depression QuickTimeﾪ and a decompressor are needed to see this picture. Jennie Chang (odd ) Allison Yee (partner) 4/5/11

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CALCULATIONS: 1. Molality Equation: M = moles / kg solvent Sample from data: 0.840g NaCl x 1 mol NaCl = 0.0144 mol NaCl 58.5g NaCl m = 0.0144 mol NaCl = 2.47 m 0.00584 kg H 2 O 2. Calculate the freezing point of your solution Equation: ∆T FP = m x K FP x ί Sample from data: ∆T FP = 2.47 m x 1.86 °C/ m x 2 = -9.19 °C 3. Molality Equation: m = ∆T FP / (K FP x ί) Sample from data: m = -10°C / (1.86 °C/ m x 2) = 2.69 m 3. Percent error Equation: E – T x 100% T 2.69 – 2.47 x 100% = 8.91% 2.47 TABLE OF RESULTS: Molality (Using data) 2.47 m
Freezing point -9.19°C Molality (Using lowest temperature) 2.69 m Percent error 8.91% DISCUSSION: This lab was extremely fun and delicious! However, there were a few sources of error. 1) At first, we couldn’t find the table spoon so we decided to just go ahead and eyeball the vanilla extract. However, we

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## This note was uploaded on 01/09/2012 for the course SCIENCE 101 taught by Professor Stevens during the Spring '10 term at Aachen University of Applied Sciences.

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lab 7 - 4.3 Lab # 7 Freezing Point Depression QuickTime and...

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