How Does the Concentration of Salt in Water Affect the Density of the Solution?
Introduction-
Density is the mass of an object divided by its volume. Density can help you understand why objects sink or float. If the density of the object is less than the density of the water, then the object will float. On the other hand, if the density of the object is more than the density of the water than the object will sink. In this lab, the density of salt water was tested to see how the concentration of salt affected the density of the solution. The guiding question for this investigation is: How does the concentration of salt in water affect the density of the solution?
Method-
Three cups of water were filled with 70 ml of water. Different concentrations of salt were put into the cups. One cup was left with no salt to serve as a control. The independent variable is the amount of salt put into each cup. The dependent variable is the density. The important constants to maintain are, the volume and temperature of water in the cups. The cups of water were then weighed on a triple beam balance to measure the mass which was recorded. Then as a second trial to improve accuracy the solutions were measured again.
After the mass was collected, it was divided by the volume to
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find the density. The data was used to make a line graph. A line graph was made because the data was showing a trend between the independent and dependent variables. In other words the data was continuous . Argument- The data that was collected supports the original hypothesis which stated the higher concentration of salt in water will result in the water having a higher density. The average density for 0g of salt otherwise known as the control measure was 0.99 , this measure was determined by dividing the mass, which was calculated on the triple beam balance, of 70.1 by the volume of 70 ml.
The average density for 5 g of salt was 1.06 and the average density for 10g of salt was 1.13. The density for 5 grams of salt is exactly 0.07 grams more than 0 grams as shown in the graph. The density for 10 grams of salt is exactly 0.07 grams more than 5 grams. This observation can explain why the line of best fit in the graph went perfectly through the points and confirm that the hypothesis was correct. It is recommended to do further testing, as there were only 2 trials and 3 test
conditions. Amt. of Salt (grams) Trial 1 Mass (grams) Trial 1 Volume (ml) Trial 1 Density (g/ml) Trial 2 Mass (grams) Trial 2 Volume (ml) Trial 2 Density (g/ml) Average Density (g/ml) 0 70.1 70 .99 69.1 70 .99 .99 5 74.2 70 1.06 74.1 70 1.06 1.06 10 79 70 1.13 78 70 1.13 1.13 Density is the mass of an object divided by its volume. An real life example of the density of salt water would be the dead sea. The amount of salt in the water increased the density of the water which is why everything so many things can float. The objects became less dense than the water, due to the increased amount of salt in the water. The data collected can clearly show that the density of the water is increased as more salt is added. The volume of the solution always stayed the same yet the mass changed which affected the density.This shows that the salt added mass. Further study, with an increased amount of test conditions and trials, can be beneficial in fully understanding how the concentration of salt affected the density of the solution.
I am doing this experiment to find the density of aluminum foil to see if it floats or sinks when placed in water. I hope to find how the density of aluminum foil changes when weight is added to the foil. I hypothesize that the boat will hold 20 pennies before sinking.
When preformed each of these experiments with each temperature of water, plugging them into the equation (Delta)(Ti – hot – Tf) T Hot x Cp x Mass(Cold) = (Delta)(Tf – Ti – Cold) T Cold x Cp x Mass(Hot)(d
The average of the three unknown solution was calculated and the concentration of the unknown solution was
Regarding the densities of Coke and Diet Coke, I believed that the density of coke would be greater than the density of Diet Coke. Because the content of Coke contains more sugar than Diet Coke, it would contain more mass and since density is mass dependent, Coke would be denser than Diet Coke. From the results of the experiment, there was a slight difference between the densities of Coke and Diet Coke. The measurements obtained from the pipette and the graduated cylinder demonstrated that Coke is denser than Diet Coke while Diet Coke was shown to be denser than Coke using the burette. With the pipette, the average density of Coke is 1.02 and the average density of Diet Coke is 0.99. With the graduated cylinder, the average density is 0.976968 and the average density of Diet Coke is 0.95. With the burette, the average density of Coke is 0.99 and the average density of Diet Coke is 1.0. Among the three instruments, the most precise was the graduated cylinder and the most accurate was the volumetric pipette. Since density is defined as mass/volume, changing the volume of Coke or Diet Coke would have changed.
This occurrence can be explained through the process of osmosis. The increase in mass as well as the increase in turgidity, in the potato tubes immersed in low sodium chloride concentration solutions is understood to be a hypertonic. Since the solution is hypertonic, the water molecules will diffuse into the area of lower water concentration (the potato tube) in order to achieve equilibrium. Alternatively, the decrease in mass in the potato tube submerged in highly concentrated sodium chloride solutions can be explained by its immersion in a hypotonic solution. As sodium chloride solution is less concentrated in water molecules than the potato tubes, the decrease in mass and loss of turgidity results from the net movement of water leaving the potato tube, which is higher in osmotic pressure, and diffusing into the solution.
I am going to carry out an experiment to measure the change in mass of
The Effect of Water Concentration on the Mass of Potato Tissue Aim: The aim of this investigation is to discover the effect of water concentration on the mass of potato tissue, and also to investigate the movement of osmosis through potato tissue. Scientific Knowledge: When a substance such as a sugar dissolves in water, the sugar molecules attract some of the water molecules and stop them moving freely. This, in effect, reduces the concentration of water molecules.
Variables --------- During the experiments, the water will be heated using different spirit burners containing different alcohols. I will be able to change different parts of the experiment. These are the. Volume of water heated:
Dish 1 after heating. m = 0.86g. We brought a beaker, and we filled it with 20 ml of water. Then, the water was added on the first evaporating dish and stirred to take in the Nacl solid. Some of the water and the Nacl were poured from the first evaporating dish to the second evaporating dish. Next, we added 10 ml of water using a beaker to the evaporation dish 1 and then pour off some of the evaporation dish 1 to the evaporation dish 2 to make sure NaCl has gone from the evaporation dish 1.We put a watch glass on the evaporation dish 2 that has NaCl and weight it on a balance and record its mass. m= 149.35g. Later, we brought an electric hot plate, and we put the evaporation dish1 and evaporation dish 2 on it in order to heat these dishes. The first evaporation dish has sand and water while the second evaporation dish has Nacl and water. In the first evaporation dish, water was gone, and the sand was remained. Eventually, we took the dish off the electric hotplate and left it for a while until it cool then we weighted the sand. Evaporation dish 1 with sand after heating m=
However, the solution could be more water than salt so the water from the solution could be more concentrated than the water inside the potato cells. If so then In theory the water in the solution should diffuse into the potato. cells and increase in mass. Apparatus: Potato to perform the experiment on. Thin metal tube to cut potato chops with.
Investigating The Effect Of Concentration Of Salt Solution On The Mass Of Potato Chips Aim: The aim of this investigation is to see whether the amount of salt solution affects the mass of the potato chip Hypothesis: In the solution below, water will diffuse from the dilute solution into the concentrated solution through the process of osmosis. Therefore the dilute solution level will fall and the concentrated level will rise Line Callout 2: Disapproved (is unable to go through the semi permeable membrane O Line Callout 2: Approved (is able to go through the semi permeable membrane P Salt solution Water [IMAGE] When a substance such as salt dissolves in water, the substance's molecules stick with some of the water molecules, so the concentration of the water molecules decreases. When the water molecules are the same concentration on both sides of a semi permeable membrane and salt is dissolved into one of them, osmosis will occur as shown in the diagram below.
= == In my investigation to find out how salt solution concentration affect the mass of potatoes, I will investigate how much the mass of a potato changes if I leave it in a beaker of water with a specified salt concentration for half an hour. I will change the salt concentration after each experiment. Background Knowledge --------------------
First, the mass of the beaker being used was recorded, then about 1g of baking soda was added and the mass recorded. Next, the mass of just the baking soda was found and recorded. Then, the contents were boiled until dry then weighed and mass recorded after cooling off. Finally, the mass of jus the salt, or sodium chloride, was found and recorded.
Part A of the experiment, we were measuring the density of water. In this part, we measured by difference by measuring the mass of the empty graduated cylinder which was 46.35 grams and then added 25.0 milliliters of water to it. When subtracting by difference, our mass of the water was 25.85 grams. This was close to the measurements of the water added to the graduated cylinder. The density of the water was 1.0 grams/milliliters.
The concept of buoyancy states that the upward force of an object immersed inside a fluid is equal to the amount of weight of the fluid it has displaced. The concept is also known as the Archimedes’ principle. After the mathematician, inventor and physicist Archimedes discovered it(Buoyancy - Concept, How it works 2014).