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chemistry lab

Title: chemistry lab
Category: Science & Technology
Details: Words: 1857 | Pages: 7.9 (approximately 235 words/page)

chemistry lab

Observations Before Experiment: · Barium Hydroxide. Ba(OH2) . 8H2O - The barium hydroxide appeared to have a slight tint of blue giving it the appearance of an off white substance. - The substance needed to be crushed or grinded down into finer pieces to allow for better reaction with the ammonium thyocyanate, NH4SCN. - Therefore a mortar and pestle was used to grind down the barium hydroxide into finer pieces. - When the substance came in contact with …showed first 75 words of 1857 total…

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…showed last 75 words of 1857 total…in temperature. Given: - Mass of water: 46.87 grams Q = (46.87)(4.18)(-10) - Ti of the water 21.5 °C Q = - 1959.166 Joules - Tf of the water 11.5 °C - DT: 1O°C - 4.03 grams of NH4 SCN(s) - 10.04 grams of Ba(OH)2.8H20(s) Calculating the heat of reaction (DHr) DHr = -(Q/n) where “n” is the number of moles DHr = -(1959.166/0.063) n=(mass / molar mass) DHr = 31097.9 Joules / mole n=(4.8/76.2) DHr =31.0979 Kilojoules / mole n=0.063 moles The heat of reaction for this experiment is 31.0979 kilojoules per mole!

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