Solubility Experiment

Hypothesis: It was hypothesised the colder the water is, the slower the tablet dissolves and the hotter the water gets, the faster the tablet dissolves. This is due to the particles heating up and getting excited thus separating the particles faster. It was suspected that the 20°C tablet in water would finish dissolving at 6 minutes, the 40° would dissolve at 4 minutes and the 50° would dissolve at 2 minutes. Also it was suspected that the 30°C tablet in water would dissolve after 4 minutes and the 60°C would finish dissolving after 1 minute.

In this lab we tested how changing the content of the water affects the speed of the alka seltzer dissolving. My hypothesis was that the tap water would dissolve the tablet fastest, the salt water would be second fastest, and the sugar water would be the slowest. I was correct that the tap water would dissolve the fastest, but I was wrong in that the salt water would dissolve faster than the sugar water. I think that our results came out the way they did because of the amount of sugar and salt we put into the water. When we put the sugar and salt into the beakers, we came up with those measurements on the spot. After the salt and sugar had been added, the salt water was very cloudy, but you could barely tell the tap water from the sugar water.

solvent- able to dissolve other substances, the liquid in which a solute is dissolved to form a solution

While looking at the results, I noticed that the cold temperature solution glowed for the longest time with an average of 14.5 minutes. The room temperature solution was next with an average of 13.5 minutes. Finally, the warm temperature glowed for the shortest amount of time with an average of 9.5 minutes. I noticed that the solubility affected the glow rate. The warm water was able to quickly dissolve the copper sulfate, Luminol, and Perborate mixture. However, the cold water took the longest because it was hard for it to dissolve. In order to keep the dissolving process going, every so often, I mixed it.

In order to clearly comprehend whether the solubility is a chemical or physical change, we must under the definition of it in the first place. Solubility means the ability for a substance to actually dissolve or in other terms solute in a solvent. Also, we need to know the difference between a physical or chemical change. In a chemical change, a chemical reaction occurs in which a new type of substance is established. In a physical change, the change itself does not alter what the substance is causing it to remain the same. The substance which dissolved in water was only salt. Solubility as a whole in my opinion is physical because no chemical changes occur to the salt substance, therefore, it is not chemically changed. As we already know,

Solute – A solute is the material (solid, liquid or gas) that is dissolved in the solvent to create the solution.

The lesson titled “The Solubility of a Salt Lab” was a lab practical that incorporated adjustments for both the ELL student and the student with an IEP. The ELL student was partnered with a highly motivated and helpful student who often displayed patience when working with peers. This student was allowed to give oral responses to written responses on assessment, but then was also be encouraged to attempt to write responses as well. The student with an IEP had a position assigned in the lab in the corner with his left side isolated and his partner place on his better functioning right side to take into consideration his difficulties processing language and from his left side. He was also provided enlarged copies of lab data worksheets to assist him recording data and encouraging him to show his calculations.

What is the relationship between solute concentration and the movement of water through a selectively permeabe membrane by the process of osmosis?

Have you ever seen a sugar cube just magically disappear when stirred in a hot cup of tea? If yes, this is the work of solubility. Solubility is the dissolving of a substance or a solute into a liquid or a solvent. In the tea example, the sugar cube would be the solute because it is being dissolved and the tea would be solvent because it is doing the dissolving. There is much more to solubility than a solute and a solvent though, there is a certain temperature that all solvents must be to dissolve a certain substance, knowledge and rules about solubility, and the thickness and polar properties of solvents.

What is solubility? Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. (Science Daily, 2014) Solubility occurs around people throughout their everyday life, and is exemplified through their food and drinks, and even the air that surrounds them. Solubility is a complex idea that can be understood in a simpler form, i.e., having hot coffee and adding sugar to it. It appears that the hot coffee melts the salt, but deeper beyond the surface the hot coffee molecules break apart the sugar molecules; the molecules are broken down, because of the increase in temperature that causes the molecules to collide harder. The collision is caused by the faster, vibrating molecules in the solution.

In this lab, the evaporation technique was used to determine the solubility of the salt at room temperature in water.

    We were testing the solubility of the chocolate syrup brands while being stirred in whole milk. Our purpose is to see which of the major brands of syrup is most soluble and for what reason. This is important to our daily lives because it makes us aware of what types of materials we are ingesting and this applies to our experiment by seeing which of the ingredients take longer to dissolve. Information known is all brands are known to dissolve in milk but they all use different ingredients and they will cause a difference in the time it takes to dissolve. New information that will be gained from this experiment is which ingredients inside chocolate syrup will take the longest to dissolve, from the type of sugars in it to the syrups. We expected the Nesquik to dissolve the fastest because it did not contain any high fructose corn syrup while the other brand of syrup did. Also we observed from the syrups that nesquik was very thin, while the others were very thick and slow in behaviour. Our hypothesis is that the Nesquik will disintegrate the fastest in the milk because it lacks High Fructose Corn Syrup.

Viscosity is not normally of knowledge, so what is it? Viscosity shows how much resistance that a liquid has to flow. When liquids have been acted upon by another force, more stresses appear, which commonly cause the fluid to have a slower flow. These fluids are known as Newtonian fluids, first discovered by Sir Isaac Newton (Groiler Multimedia Encyclopedia). Viscosity is a way to show how much resistance each liquid has to flow in a motion. When forces act upon these liquids, they tend to want to slow down. This is what commonly happens. These liquids that follow the common trend are known as Newtonian fluids, which Sir Isaac Newton first discovered. Solubility is how much of a solute will dissolve into a liquid, or the solvent. If the solute dissolves completely, then the liquid will flow more quickly, meaning it isn’t as viscous. If the solute only partially dissolves, the liquid is most likely more viscous (“Oxlade 34-36”). Solubility is a measure of how much of an object will dissolve into another liquid. The liquid is known as the solvent. When the object completely dissolves, the liquid will most likely be less viscous, and flow easier. If the solute

Different substances are not equally soluble in water because each substance dissolves differently. For example the sodium nitrate took longer to dissolve than the sodium chloride because they are different substances. Some substances also may not dissolve at all in water. Also, substances have all different types of shapes and sizes, and larger substances may take longer to dissolve than smaller ones.

Use of Additives may increase or decrease the solubility of a solute in a given solvent. The effect of an additive depends very much on the influence: it has on the structure of water or its ability to compete with solvent of water molecules.