The purpose of this lab was to learn how to determine the percent of water in a hydrate.…
A 125 mL flask was obtained. The square of aluminum was fashioned over the flask by laying the foil over the mouth and folding the sides down. A pin was then obtained and was used to poke a tiny hole in the center of the aluminum cap.…
get the mass of a evaporating dish, put a sample of the hydrate onto the evaporating dish and mass the dish with hydrate.…
4-6: Why did lung function in the deflated (left) lung return to normal after you clicked Reset?…
1. If the room temperature for this experiment had been lower, the length of the resonating air column would have been shorter. The length of air column is directly proportional to temperature due to v=331msT273 .…
In order to find the formula of the copper chloride hydrate, we had to separate the compound to find the mass of water and copper. To begin this process, we evaporated the water and created an anhydrous compound, meaning we were left with only CuxCly. By calculating the weight of both the anhydrous and the hydrated compounds, we could conclude that the difference in the weights was the weight of the H2O. From this we were able to calculate the percent composition of CuxCly and H2O (see Calculations: Part I: Dehydration of Hydrated Copper Chloride), which showed how much of the compound was copper chloride by mass. Since there are only two stable forms of copper chloride, we concluded that possible formulas would be either CuCl or CuCl2. Intending…
A sample of copper sulfate pentahydrate (6.285g) was weighed out. The copper sulfate pentahydrate was dissolved in water (11.99mL) in a 250mL beaker. The solution was heated on a hot plate to 90 degrees Celsius. A sample of potassium oxalate monohydrate (10.006g) was dissolved in water (50.0mL).…
A. Create a solubility curve for NH4Cl by plotting g NH4Cl/100 mL H20 on the y-axis, and crystallization temperature on the x-axis. Make sure to label each axis. On the same graph as the solubility curve for NH4Cl, add the solubility curve for NaCl using the data provided in Data Table 3.…
The overall purpose of the lab is the understanding of the process and goals of the scientific method. This lab illustrates that this method is very useful to answer a question or address a problem base on observations and the available information.…
An ion is an atom or a molecule with a positive or a negative charge due to the loss or gain of one or more electrons. Ionic solids are salts (such as NaCl) that are held together by a strong force of attraction between ions of opposite charge. Molecules are the smallest physical units of an element or a (chemical) compound. Ionic solids are also known as salts because salts are ionic compounds that are formed from a reaction between an acid and a base.…
The purpose of this lab is to determine the formula of a given hydrate through collecting and calculating experimental data.…
A hydrate was given to our group and the identity of the hydrate was unknown. The lab workers were told to determine the identity of the unknown hydrate. The identity of the hydrate could be determined by calculating the hydrate’s percent of water. So the lab workers set out to determine the water percent of the unknown hydrate.…
A hydrate is any compound that contains water in the form of H2O molecules and usually has a definite content of water by weight. Hydrates typically have a crystal like appearance that can vary in colour and have a naming scheme based on the compound and number of water molecules that are in the hydrate. Copper(II) sulfate pentahydrate, or CuSO4 * 5H2O, is a ratio of one copper sulfate to five (penta) molecules of water. Copper sulfate pentahydrate is a blue hydrate while anhydrous copper sulfate (CuSO4) is white. To get anhydrous copper sulfate, copper sulfate pentahydrate must go through an endothermic reaction and have all of its water molecules evaporated.…
The mass percent of water was determined using the mass of water and dividing it by the total mass of the hydrate and then multiplying that answer by 100%. The number of moles of water in a hydrate was determined by taking the mass of the water released and dividing it by the molar mass of water. The number of moles of water and the number of moles of the hydrate was used to calculate the ratio of moles of water to moles of the sample. This ratio was then used to write the new and balanced equation of the dehydration process. The sample was then rehydrated to the original state and the percent of the hydrate recovered was calculated by using the mass of the rehydrated sample by the mass of the original hydrate and then multiplied by 100%.…
.2400 grams of the unknown compound. This is done in duplicate and purple-tinted precipitates are placed in Gooch crucibles. The precipitates are suction dried using ethyl alcohol then acetone to…