Fr-5a.docx

Experiment 5: Relative Density Laboratory Report Diego Ramos, Ma. Rollene Ramos, Dale Joseph Salazar, Dana Samonte Department of Math and Physics College of Science, University of Santo Tomas España, Manila Philippines

Abstract 1. Introduction 2. Theory 3. Methodology 4. Results and Discussion Table 1.1 Relative Density of Cylinder Mass of cylinder (g) 16.88 g Initial level of water (cc/mL) 27 mL (Li) Final level of water (cc/mL) 33 mL (Lf) Volume of cylinder (cc/mL( 6 mL (Lf -Li ) Density of cylinder 2.81 g/cc Accepted density of aluminum 2.70 g/cc Percent error 4.07% The accumulated data is summarized in the table to calculate for the relative density of a cylinder. The water displaced is the difference of the final and initial level of water when the cylinder was set down. The percent error of 4.07%c ould be caused by the inconsistency of estimating the water displacement amid the experiment and the rounding off from values in the middle of calculations. Table 2.1 Relative Density of Bone Sample Weight of the bone in air (g) 60 g Weight of the bone in water 37 g (g) Relative density of bone 2.6 g Density of bone (g/cc) 2.6 g/cc Finding osteopetrosis

The table demonstrates the findings of the bone sample given. Findings indicated Osteopetrosis since the bone sample displayed a bone density of 2.6 which is almost 1.0 SD above the normal standard or mean of 1.8. Table 3.1 Regular Coke vs. Diet Coke Relative Densities Weight of empty pycnometer 24.21 g Weight of pycnometer 44.89 g with water Weight of pycnometer 49.56 g with regular coke Weight of pycnometer 44.48 g with diet coke Relative density of regular 1.027 coke Density of regular coke 1.027 g/cc Relative density of diet coke 0.98 Density of diet coke 0.98 g/cc The data shown in the table demonstrates a notable distinction between the densities and weight of regular coke and diet coke. It is evident that the regular coke was thicker and denser than the diet coke. 5. Conclusion In this experiment, there are variety of ways done to determine the density of a specific object. These objects were cylinder, bone, diet coke, and regular coke. The first way to know the density of the object, the weight and volume of cylinder was measured. The second way is to use the

weight in the air and the weight of the bone. This method also identifies the condition of the bone. Lastly, the pycnometer was used to compare the densities of two types of soft drinks. The first method got a density of the cylinder was 2.81g/cc. The second method obtained a density 2.6g/cc and the group found out that the bone has osteoporosis. For the last method, regular soft drink has the higher density than the diet soft drink. 6. Applications 1. How can you distinguish “Fool’s Gold” from pure gold? The density of pure gold is heavier than the fool’s gold so when they suspend in water the fool’s gold will float and the pure gold will sink. The lesser the displaced water, the higher chance that the object submerged is pure gold. 2. The solid samples used in the experiment are denser than water. How will you determine the density of a solid that is less than water? First, place the solid sample in water then note the amount of water displaced by the floating solid sample. Next, repeat the previous process but instead of putting the solid in water, submerge the sample under the water. Then note the water displaced. Calculate the relative density (RD) by dividing the density of the floating solid by the submerged solid. As the density of water is1.00g/cc, then the RD is equal to the density of the solid itself. 3. The suitability of a person to donate blood may be tested by placing a drop of his blood in a saline solution of density 1.03 g/cc.

Is he a suitable donor if the drop of blood sinks? Explain your answer. Blood’s normal density is 1.06 g/cc and if it sinks in the saline solution it means that the density of saline is near the density of the blood that would make the person a suitable donor. 4. What is the meaning of the expression “tip of iceberg”? Is there a physical basis for this? The “tip of the iceberg” means that only a small part of the bigger problem is being seen. The physical basis to this implies that only a small part is relatively visible while the larger part is hidden underneath. Literally, when you see an iceberg, you are only seeing a portion of its entire body since most of its part is submerged under the water. 5. Normal relative density of urine is from 1.015 – 1.030. What might be said if during urinalysis, a specific gravity higher than normal is obtained? If it exceeds the normal relative density of urine, then it means that relative dehydration is observed. This is the state where there is an increase in the effective osmotic pressure of body fluids. 7. References