For sulphate salts, all are soluble except Lead A larger effect is decomposing copper sulfate to copper oxide and sulfur trioxide. ), During heating, some of the hydrous salt may have spattered, thus removing a portion of the hydrous salt from the crucible (A more likely source of error, considering that this would result in a greater difference between the two ratios, and percentages. Also as I was calculating the empirical formula, I wasn't quite sure the figures were correct so I might have miscalculated. However, immediately after the first heating, It can be clearly seen that the heated copper sulfate has now transformed into a grainy and whitish-gray form. which is stored for some time will have iron(III) sulphate If a chemical reaction occurred, write a balanced equation for it. To find the expected error in the answer, $\Delta X$, assuming no error in the molecular masses, we calculate: Do you have pictures of Gracie Thompson from the movie Gracie's choice. Building on previous knowledge of ions and formulas from Part One & Two are included in the Exit Ticket and the Homework. TPT empowers educators to teach at their best. cup' method. Any anhydrous compound from a hydrate generally has the following properties: Most hydrates are stable at room temperature. sulphate, calcium sulphate and lead sulphate. Measured mass of crucible with anhydrous copper sulfate: 37.3005g * Vinegar Coloring pages - Water facts, how it helps the brain, how it helps the body, ideas on drinking more water. Anhydrate: The compound after the water molecule has been removed. From the masses of the water and anhydrous solid and the molar mass of the anhydrous solid (the formula of the anhydrous solid will be provided), the number of moles of water and moles of the anhydrous solid are calculated as shown below (\ref{4}, \ref{5}): \[n_{\ce{H2O}} = \frac{m_{\ce{H2O}}}{MM_{\ce{H2O}}} \label{4}\], \[n_{\text{Anhydrous Solid}} = \frac{m_{\text{Anhydrous Solid}}}{MM_{\text{Anhydrous Solid}}} \label{5}\]. When you have completed the experiment, dissolve all your heated residues in water, put all your solids and liquids in the waste crock. What did you learn? +1. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. Iron (III) chloride. Given the data presented above, findings showed the experimental percentage of water within the hydrated salt to be: 47.10%, The accepted percentage of water within hydrated copper sulfate is:36.07%, As such, the percent error within this measurement is30.57%, The experimental stoichiometric ratio between copper sulfate and water was found to be: 1:5.314, The accepted stoichiometric ratio between copper sulfate and water is: 1:5, The percent error within this measurement is 5.909%. Easel assessment included with this lesson plan.CDC HEALTH STANDARD SEVEN: Students will demonstrate the ability to practice health enhancing behaviors and to avoid or re, 9 worksheets to practice naming and writing formulas for ionic and covalent compounds, including acids and hydrates. Calculate your % error: "absolute value of . The residue obtained after heating, called the anhydrous compound, will have a different structure and texture and may have a different color than the hydrate. Rounded to the nearest integer, the ratio is 1:5. Record the appearance of the hydrate before it is heated. In this experiment, the percentage by mass of sulfate in an unknown sulfate salt will be determined by gravimetric analysis. The purpose of this lab is to determine the relationship between moles of copper sulfate and moles of water in a hydrate. * Paper towel Includes teacher instructions, sample calculations, and a key to the conclusion questions. Added deionized water to the anhydrous copper sulfate, at which point it became hydrated again, and returned to its original blue coloration. Record the mass of the crucible, cover and sample. Note: This is an editable animated PowerPoint. Use this picture to get the mass of the hydrate (blue powder). Be sure that the flame will be close enough to the triangle to engulf the entire crucible. The copper sulfate is dissolved in 100ml of water that is distilled and contained in . To determine the mass of the water, subtract the anhydrate from the hydrate and put it in the proper space above. Will this likely lead to a higher or lower value of \(x\) than the actual value? The difference between 5.00 and 5.16 is a weight error of about 200mg, and I was really careful, so this seems unlikely. I can also customize anything you've already purchased.Check out some of my other work!Atomic StructureIonic CompoundsNomenclatureGeneral ChemistryScientific Method, End your nomenclature unit with a lab! Make sure that the tube is clamped near the bung as shown. ), Not all of the water may have evaporated during heating (Also unlikely, for the same reason as the one above. Then using the A, B symbols, this lab will be to determine the percent water in an unknown hydrate, determine the moles of water present in each mole of the unknown substance, and to use the molecular mass to find the empirical formula of a hydrate. I was born December18,1963When would I graduate high school? You can check for this by looking for the telltale brown/black color of copper oxide. present. { "01:_Using_Excel_for_Graphical_Analysis_of_Data_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "02:_The_Densities_of_Solutions_and_Solids_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "03:_Paper_Chromatography-_Separation_and_Identification_of_Five_Metal_Cations_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "04:_Inorganic_Nomenclature_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "05:_Properties_of_Hydrates_(Experiment)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "06:_Types_of_Chemical_Reactions__(Experiment)" : "property get [Map 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water of hydration in a hydrate.

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