7H 2 O) is a heptahydrate of magnesium sulfate: within one mole of magnesium sulfate heptahydrate are seven moles of water. Solutions were made up of two parts, the solute and the solvent. If the results of your calculations suggest that you have some water left in the residue, reheat your sample for an additional 5 minutes, allow it to cool down and weigh it again. This is probably a small effect. (However, this is not likely to be the sole cause of the inaccuracies within this experiment, though it may contribute to it. Why do men's bikes have high bars where you can hit your testicles while women's bikes have the bar much lower? We can also (via stochiometric and molar ratios), calculate the ratio of salt to water. Naming and Formulas: Simple Ionic and Covalent Compounds Lab written for Hotplate or Bunsen burner.Students: Observe water leaving compound as steam Heat to constant mass Calculate percent water Re-hydrate the anhydrous compoundLab Contains: Student Lab Sh, This lab is a great way for your students to investigate what a hydrate is and how its formula is determined. The copper sulfate moles should be the smaller. Grace Timler My background is a PhD in organic chemistry, so Im familiar with hazard assessment, and all the lab work I do with my student is something Ive done myself already. The salt is magnesium sulfate - MgSO 4 and, the same as Copper sulfate, it exists as a hydrate, but in this case we will find the amount of water surrounding the compound. Purpose: I can also customize anything you', Looking for an engaging way for your students to review nomenclature for acids, bases and hydrates? PDF Experiment 1 Hydrates Molarity is calculated by diving the number of moles in the solute by the volume (in liters) of the complete solution. Includes teacher instructions, sample calculations, and a key to the conclusion questions. Ms. Macielag's Thursday Lab Class (Honors), Building and Identifying All Organic Compounds, Lab Book: Setting Up Graphing Reference Sections, Naming and Writing Formulas (without Formula Mass). As such, there is always the possibility of inaccuracies with measurement, perception of measurement, inaccuracies of equipment, and other such errors. How many moles of water (x) do you think are in this hydrate? Copper sulphate ; CuSO4.5H2O (NB The 5H2O is the water of hydration held in the crystal ; like you hold a tennis ball in your hand). A hot crucible looks like a cold one, avoid direct contact with the crucible, clay triangle and ring stand until you are sure they are cooled. There are some possible sources of experimental error for this lab For example, because for Trial 1 there was not exactly 2 mL of Copper Sulfate and 8 mL of distilled water, the concentration of the solution definitely could not be 0.080M.

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