Solubility

Identifying Unknown Substance. Examining the physical characteristics of the available compounds in the lab was how possible compounds were eliminated from any or further testing. Based on how the compounds physically looked, it was almost for certain that calcium chloride was the unknown compound. However, another compound was used to test as well (ammonium chloride) since relying only on physical characteristics alone would not allow for proper experimentation. The unknown ended up being…

glass vials with liquid (diluent) stored for two weeks on dry ice. Correction of total pressure measurement for carbon dioxide ingress into positive controls indicated reduced pressure instead of over-pressure – result attributed to significant solubility of carbon dioxide in water at room temperature. Results highlight pH change of liquid product as potential hazard of leak during dry ice storage.…

and adhesive properties which were observed in previous documents, However, profile of PVA the swelling hydrogels depends on the amount of time that it was immersed in water. Apart from above characteristics this polymer also exhibits good water solubility, biocompatibility, drug compatibility, film forming, and mechanical properties. As the drug release was slowed down at higher concentration because of that reason low molecular weight of hydrogel was preferred in this present…

Chemistry relates to everything you could possibly think of on the planet. They relate to every object and every natural event and hazard. Such as sinkholes, there a very intimidating and scary event that could happen at any moment . Sinkholes occur when the limestone beneath us breaks away by acidic rain and eventually the ground gives creating an open hole in our earth`s surface. Chemistry can relate to chemical reactions, one of the chemical reactions that occur is the creation of acidic rain…

It is well known that all organisms require at least some water to survive, even the most hardy creature on the planet earth, the tardigrade, Hypsibius dujardini, which can survive near complete dehydration, exposure to extreme radiation, vacuum, temperature and pressure, must be rejuvenated with water if it is to resume life after near complete desiccation (Gabriel, et al. 2007). H. dujardini, famous for surviving some of the harshest conditions of any organism we know of, is a perfect example…

occurs when adhesive forces, the attraction between particles of the same type, outweigh cohesive forces, attraction between two different particles (Ellis, n.d.). How far a mixture's pigments move up the filter paper depends on each pigment's solubility with the mobile phase (Science Buddies, 2014). More soluble pigments react more with the solvent than the filter paper, and get carried by the solvent further up the paper. Less soluble pigments react more with the filter paper than the…

My science fair question was “Is the hardness of water the same everywhere?”. This question is ironic due to the fact that water has a very loose molecular structure and takes no shape without a container. The term hardness has a different meaning in this project instead of the adjective meaning firm or stiff it deals with the components of water. More specifically when dealing with molecular structure, hardness is the concentrations of mineral ions like magnesium and calcium inside the water. I…

that bone meal is only available to plants in soils that have a pH below 7.0 (Card et. al., 2014). Blood meal is one of the highest N concentrations of any organic fertilizer source. It is rapidly available for plant uptake because of its high solubility. Blood meal is commonly used in other organic mixtures to give a quick plant response. The biggest drawback to blood meal products is that a large portion is composed of readily available N, causing potential burning of plant tissue and loss…

Using qualitative analysis, two cations in an unknown solution was identified. After repeated mixing, centrifugation, and decanting, lead was confirmed in Part A and barium in Part B. In Part C, different colored flames of metal species were observed using cation flame tests. Formula unit, total ionic, and net ionic equations were then composed for the identified cations. If the experiment were to be repeated, step 13 could be ommitted as barium was already confirmed in step 12 with the…

synthesis. The drug specifically inhibits competitively and reversibly dihydrofolato reductase. MTX is still serving as the gold standard therapy used to be prescribed systemically in psoriasis. The problem faced the topical forms of this drug was its solubility in the water and the ionized nature at the physiological pH mainly cause reduction in the passive diffusion through layers of the skin. Noticeably, psoriatic skin shows reduced water content and impaired barrier function, concludes to…