Determining the formula of an unknown hydrate in this lab you will determine both the identity of the anhydrous salt and the number of waters of hydration in an unknown hydrate. To determine its molecular formula, you have to do an experiment to find its molecular (molar) mass the empirical formula is the simplest formula of a compound the actual formula is an integral multiple of the empirical formula. The formula of a hydrate consists of the formula of the anhydrous (without water) compound followed by a dot, then the number of molecules of water that crystallize with one formula unit of the compound, then the formula of water.
36 determining the formula of a determining the empirical and molecular formulas of to be both a molecular formula and an empirical formula for a. In this calculation, the hydrate is fecl3 xh2o where x is the unknown number of moles of water of hydration in the formula that we are trying to determine data: given: formula of the anhydride = fecl3 1. Compound will be determined and the formula of the hydrate will be calculated introduction a hydrate is a chemical compound that contains water as part of its crystal structure.
A common experiment in the characterization of new or unknown compounds is to measure the mass of water driven off from a sample of the compound when it is heated this is true whether the compound is a hydrate or has merely adsorbed water on the surface of its crystals. Another sulfate hydrate to compare the hydrates and see if there is a pattern of the different hydrate and the number of water molecules due to factors of periodicity also we could have also just used sulfate hydrate to observe how adding another element affect the water and salt ratio. The empirical formula is the simplest version of a chemical formula for example c3h8 the molecular formula contains information on the actual number of atoms of each element in the molecule where c3h8 or c6h18. Ap chemistry p2 experiment 2: formula of a hydrate 9/24/2013 purpose: calculate the percent composition of water in a hydrate and determine the empirical formula of the hydrate.
Example #2: a hydrate of na 2 co 3 has a mass of 431 g before heating after heating, the mass of the anhydrous compound is found to be 322 g determine the formula of the hydrate and then write out the name of the hydrate. To experimentally determine the number moles of water of hydration in an unknown hydrate background water, the most common chemical on earth, can be found in the atmosphere as water vapor. Laboratory 4: determining the identity of an unknown compound procedure in this experiment you will be observing the reactions of 6 known compounds and one unknown compound with diﬀerent. An empirical formula of a chemical compound is the ratio of atoms in simplest whole-number terms of each present element in the compound for example, glucose is c 6 h 12 o 6 it's empirical formula is ch 2 o. In this experiment you will determine the formula of a copper chloride copper usually exists as a +1 and +2 oxidation states give at least two possible chemical formulas you expect for cu(x)cl(y) where x & y are integers.
A student was assigned the task of determining the molar mass of an unknown gas the student measured the mass of a sealed 843 ml rigid flask that contained dry air the student then flushed the flask with the unknown gas, resealed it, and measured the mass again. In this experiment, an unknown ionic hydrate was heated in order break any bonds between water molecules and the salt's crystal lattice to recover the original salt then when given the molar mass of the unknown salt, the ratio of h 2 o to salt in the original hydrate was able to be figured out. 1 determining the percent composition and formula of a copper chloride hydrate overview: the mass percents of cu, cl and h 2o in a compound are determined by separating and massing. Lab - formula of a hydrate - help with calculations magnesium sulfate ( mgso 4) is a molecule that loves to hold on to water (hydrophilic)in this lab we actually calculate the formula of the formula for the hydrate.
A chemist is given a sample of the cuso4 hydrate and asked to determine the empirical formula of it the original sample weighed 4275 g after heating to remove the waters of hydration, the sample weighed 2738 g. Determining the chemical formula of a hydrate chemistry 11 3/5/2013 purpose: to determine the percent by mass of water in a hydrate of copper (ii) sulfate hydrate hypothesis: i hypothesize that when the solution is heated the hydrate will convert to an anhydrous ionic compound. Experiment 4: composition of a hydrate 55 purpose: determine the empirical formula of an unknown hydrate and the percentage by mass of water in the hydrate.