Chem 2 Lab 1 2018 (1).docx - Constructing a Solubility...

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Chapter 16 / Exercise 61
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Constructing a Solubility versus Temperature Curve for an Unknown Potassium Salt Alex Diamantino Professor Porter 01/24/2018
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Chapter 16 / Exercise 61
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Objectives: The objectives of this lab involve students to find the relationship between solubility and temperature as well as be able to construct a solubility-temperature curve for an unknown. Unknown Number: 7 Mass of Sample Boat: N/A Mass of the flask, tube, and unknown: 147.50g
Weight of the Unknown Salt Sample: 6.50g Initial Buret Reading (Run 0): 20.59mL Next Buret Reading (Run 1): 23.52mL Total (net) Volume (Run 1): 7.43mL Initial Solubility: 222.0g/mL Saturation Temperature: 92*C Run Vol. of H20 (mL) Saturation Temperature (*C) Solubility Buret Reading Total Volume 0 20.59mL 2.93mL 2.93mL 2.93mL 1 3.43mL 92.0*C 190.g/mL 2 3.98mL 89.0*C 165.g/mL 3 4.43mL 85.5*C 147.g/mL 4 4.93mL 78.0*C 132.g/mL 5 5.43mL 65.0*C 120.g/mL 6 5.93mL 63.0*C 110.g/mL 7 6.43mL 60.0*C 101.g/mL 8 6.93mL 55.0*C 93.8g/mL 9 7.43 52.0*C 87.5g/mL The identity of the unknown salt is likely KNO3 Unknown Number: 7
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