Analysis of hydrated sulfate salts team date section instructions : complete the following questions and hand in at the start of your lab period show your work with units and. In the lab, using heat you converted a sample of a hydrated salt to anhydrous salt how could you tell when all the water had been evaporated when continuous heating of the sample has no further effect on the weight of the sample. 5 remove the lid and continue to heat the nickel (ii) sulfate for about 10 minutes or until it appears completely light yellow now you know all the water has been driven off (evaporated) from the salt. Experiment 5 – percent water in a hydrated salt pre-lab hints 1 note definition of deliquescent in the introduction 2 see side notes for part a, as well as part 1 of technique 15c (pg 27) 3 mass of water in sample is the mass lost by heating (initial minus final. Hydrate lab purpose the objective of this experiment is to determine the number of moles of water associated with one mole of copper sulfate, in the hydrate cuso 4 when the water of hydration is removed from the hydrate, the salt that remains is said to be anhydrous.
Properties of hydrates in this experiment, you will study and observe the properties of hydrated compounds you will then be able to determine the number of water molecules associated with an unknown hydrated. From the masses of vaporized water and of the anhydrous ionic salt, determine the formula of the hydrate procedure (details) each student will work individually thoroughly wipe a crucible and cover with a clean cloth towel to remove dirt and other particulate matter. Honors chemistry hydrated salt lab quiz-ch choose the best answer for each of the following: 1) which of the following would best explain why the crucible was heated before beginning the hydrated salt lab. Lab #5 formula of a hydrate purpose: to determine the percent by weight of water hydrated to a salt to establish for formula of a hydrated salt principles: many salts occurring in nature or purchased from chemical suppliers are hydrated that is, a number of water molecules are bound to the ions in the crystalline structure of the salt.
Laboratory exercise: the chemical formula of a hydrate 5 add ~2g of the epsom salt to the crucible and re-weigh the crucible and lid 6 return the crucible with the sample to the clay triangle and set the lid off the crucible’s edge to allow the gaseous water to escape. First, the crucible with the hydrated salt will be over the flam for ten minutes then the measurement of mass of the crucible, lid, and now an-hydrated salt will be taken the filled crucible will then be placed again over the flame, this time for only two minutes, and measured for mass once again. The formula of the hydrate shows the ratio of the moles of anhydrous salt to the moles of water in the above case, that ratio is 1:5 objective: in this experiment, you will be given a sample of hydrate. Csus department of chemistry experiment 2 chem 1a experiment objectives: 1 experimentally determine the chemical formula of a known hydrate ma x h 2o(s) given the identity of the anhydrous salt mx.
Experiment 7: hydrates introduction: you will determine the percentage of water in a hydrate and the empirical formula of a hydrated salt background: hydrates are chemical compounds that contain water as part of their crystal structure this water is strongly bonded, is present in a definite proportion, and is referred to as experiment 5. By adding water to the anhydrous salt, the hydrate will reform some anhydrous salts can absorb moisture from the air to become hydrated these salts calculations for the experiment 5 after completing the calculations, inspect the compound inside the crucible use your. 5) find the ratio of moles of water lost to moles of anhydrous salt 6) for purposes of this experiment assume that the moles of water in the formula of the hydrate is a whole number.
Approxiamately add 2 gram of hydrated salt, weight and record the data 4 salt are heat gradually in crucible without its cover for around 3-5 minutes 5 any colour changes are observed. Hydrate lab purpose: hydrate - a compound that contains the water molecule in this case, cuso4 h2o anhydrate - a compound that does not contain the water molecule in this case cuso4 the goal of the lab is to find out how many water molecules are in the hydrate molecule when this is found you will be able to write the formula and. Name _____ prelab for hydrate lab fill in the blanks in the chart below and answer the three questions. Csus department of chemistry experiment 2 chem 1a rev f11 page 3 of 6 experiment objectives: 1 experimentally determine the chemical formula of a known hydrate mx ∙ n h2o(s) given the identity of the anhydrous salt mx.
Prelab video to help academic chemistry students at wyomissing area jr/sr high school, wyomissing, pa. Properties of hydrates purpose: the purpose of this experiment is to determine whether certain compounds are hydrates, and to determine the formula of a hydrate of unknown composition. Formula of the hydrate shows the ratio of the moles of anhydrous salt to the moles of water in the above case, that ratio is 1:5 in this experiment, you will be given a sample of hydrate. Properties, it is a true hydrate if at least one of them is not present, the compound is not compounds to be tested : nickel (ii) chloride, cobalt (ii) chloride, sucrose, calcium carbonate, barium chloride, sodium tetraborate, potassium chloride.
The anhydrous salt is cuso4 so the mass of the anhydrous salt is the mass of cuso4 you want to find the number of moles of cuso4 by dividing by the mole mass of cuso4 next you want to find the number of moles of water lost (since that is the same as the water that was originally part of the hydrate. You will be weighing a hydrate and heating it to remove the water (now called anhydrous salt) and weigh it again you can now find the percent of the anhydrous salt and the water by finding a mol ratio, you can find out how many moles of water there are per mol of anhydrous salt. Formula of a hydrate introduction: many salts form compounds in which a definite number of moles of water are combined with each mole of the anhydrous salt.