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Stoichiometry Of Copper II + Hydroxide

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Recommended: The study of stoichiometry chemistry lab

Introduction In the late 1700’s, Jeremias Benjamin Richter defined stoichiometry as the "art of chemical measurements, which has to deal with the laws according to which substances unite to form chemical compounds." In this exercise, we combined copper(II) sulfate pentahydrate with two moles of sodium hydroxide which produced copper(II) hydroxide and sodium sulfate (CuSO4 + 5H2O +2NaOH  Cu(OH)2 + Na2SO4). We then dissociated copper(II) hydroxide to produce copper(II) oxide and water (Cu(OH)2  CuO + H2O). The objective of this exercise is to perform a simple chemical reaction where the concept of stoichiometry is put into practice (2). The goal of this experiment was to make Copper(II) oxide. Copper(II) oxide is an important substance in …show more content…

To do this you first have to place the weighing boat on the scale and hit tare, so it reads zero and then place copper(II) sulfate pentahydrate on the weighing boat. Transfer the copper(II) sulfate into a 250-mL beaker. Rinse the weighing boat with 5 mL of purified water in small quantities to rinse off leftover chemical into the beaker. Spin the beaker gently to dissolve the solid. Rinse the sides of the beaker with small amounts of the 5 mL of purified water. Measure and carefully add 10 mL of 6.0 M NaOH to the beaker and cautiously swirl to mix. Take a watch glass and set it over the beaker to cover. Heat gently on a hot plate to the boiling point of the solution. If any spattering occurs while heating, wash the solid back down into the solution using a wash bottle. Heat the solution until all the blue solid has been decomposed to the dark colored copper(II) oxide. Allow the mixture to cool before filtering. Fold a piece of the Whatman filter paper while waiting for the mixture to cool. To fold the Whatman paper, you first fold it in half, and then in half again. Open it by grouping three of the folds at the opening together and leaving one on the other …show more content…

This means that there were a few errors made during the exercise. While we cannot pin point the main reason why the percent yield is so high, there’s a few possibilities. First, it might not all be CuO, there could have still been water in the filter paper and precipitate when we took it out of the funnel which would cause the mass to change and affect the percent yield. But the main possibility as to the high percent yield is that there is still some Cu(OH)2 in the precipitate that never got broken down when heated which affected the percent

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