Determination of Density with Water Displacement Method

docx

School

Utah Valley University *

*We aren’t endorsed by this school

Course

3500

Subject

Chemistry

Date

Feb 20, 2024

Type

docx

Pages

Uploaded by GeneralIbis4056

Determination of Density with Water Displacement Method Ashley Massey Introduction The objective of this experiment was to determine the percent composition through the process of distillation and solubility. This was accomplished by utilizing iron, sand, and salt and calculating the density of sand by measuring their mass and volume. The volume was measured using 25mL graduated cylinder and distilled water, along with pure sand. The density of the mass was measure by each individual substance via extracting iron via a magnet, filtering sand with a Buchner funnel, and dissolving sand using a 150mL beakers. Procedure There were two parts of this experiment that needed to be completed. For part 1, iron was separated from the mixture via a magnet wrapped in a plastic bag. This allows for accurate extraction of the iron which could alter the overall mass. Salt was then dissolved but adding 20.0mL of water to a beaker and stirring until the water was translucent. To isolate the sand, a Buchner funnel attached to a vacuum and filter paper was used to remove all traces of the remaining water and to “dry” the sand using a quick drying oven to remove the remaining moisture which could alter the mass. Once all substances were measure the prevent masses were calculated using equation (mass component (g)/total mass of mixture) x 100. Part 2 of the experiment was to determine density. The equation used for this portion was grams/mL. For this experiment, pure sand volume was measured by added 1g four times in a graduated cylinder with a starting total volume of roughly estimated 10mL. Results: PART1 Vial A Mixture Fe Sand Salt Mass (g) 4.629 0.634 2.694 1.301 Experiments wt. % N/a 13.695 58.201 28.104 Actual wt. (%) N/a 11.80 58.50 29.50 Error (%) N/a 16.059 0.511 4.408 Part 2: Sand Transfer Total mass of sand (g) Total volume of sand (mL) 1 1.0747 10.8 2 0.9823 11.1 3 1.0740 11.2 4 1.0702 11.7 Calculations: Formula for: - density: mass (g)/volume(L) - Experimental wt. in %: substance measurement mass/total mixture mass x 100 = % Fe: (.6339g/4.6288g)x100 = 13.695%

- : % error = ¿ ( measured value − actual value ) ∨ ¿ actual value x 100 ¿ . *actual wt % provided by instructor Fe: ( |13.695-11.80| / 11.80 ) x 100 = 16.059% Discussion: Even though the measurements were attempted to be taken as accurately as possible the procedure was not precise which is evident in inconsistent measurements in the error % as well as the scatter plot. As seen in part 1’s table, the iron measurement has the largest error percentage. When recording measurements and calculating density, both mass and volume was rounded to the nearest 3 significant figures The inconstant measurements could be predicted due to the transfer of substances to and from the weigh boat and the graduated cylinder. When the sand was poured, the moisture and drops of water located on the wall of graduated cylinder stuck to the sides.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version