# Chem Lab - Density

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Experiment 1: Density

February 8th 2016

Professor Dr. Stanley

Monday 12:00-2:50p

Introduction: Density is most often described as mass per volume of a substance. Mathematically, it can be written as;

d=m/v

The purpose of this experiment is to determine the density of an unknown metal in Part A,

and also to determine the density of a water/ethanol mixture in Part B. In order to acquire my results, the approach I used involved following the proper instructions given. In order for my findings to be precise I meticulously recorded exact measurements.

Data & Results:

Part A: Density of unknown metal

 After 1st addition of metal After 2nd addition of metal After 3rd addition of metal After 4th addition of metal Volume of water plus metal 36.0mL 38.0mL 40.0mL 42.0mL Volume volume of water in cylinder prior to addition of first metal portion* 35.0mL 35.0mL 35.0mL 35.0mL Volume of metal 1.0mL 3.0mL 5.0mL 7.0mL Mass of cylinder, water and metal 118.02g 123.46g 132.93g 142.95g Initial mass of cylinder plus water prior to addition of first metal portion# 108.94g 108.94g 108.94g 108.94g Mass of metal 9.06g 15.52g 26.99g 38.06g

Density: Determined by slope the line = 5.60

Unknown metal: Mossy Tin

Part B: Density of water/ethanol mixture                         Unknown #5

Mass of Erlenmeyer + solution (g)   131.671            140.105      152.43          168.121      177.711

Mass of Erlenmeyer (g)                  113.184     131.671      140.105        152.428      168.121

Mass of solution (g)                          17.83         8.435                 12.32            15.69           9.589

Final buret reading(mL)                    42.61        19.60           32.52            49.60           34.00

Initial buret reading (mL)                 23.6          10.0              12.5                 23.6             17.5

Volume of Solution (mL)                 19.0          9.40              20.0              26.0             16.5

Temperature (Degrees C)                  20.0           20.0              20.0              20.0             20.0

Density (m/V)                                  .9384         .8973            .6161           .6035           .5811

Deviation from mean                         Density                    Absolute Deviation

Trial 1                                         .9384                                .21112

Trial 2                                         .8973                                .17002

Trial 3                                         .6161                                .11118

Trial 4                                         .6035                                .12378

Trial 5                                         .5811                                .14618

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