## Question

###### Determining Solution Concentration by Evaporation Pre-lab Nam Section In the lab, you weigh an empty beaker...

Determining Solution Concentration by Evaporation Pre-lab Nam Section In the lab, you weigh an empty beaker and find it to be 28.3456 grams. You use a volumetric pipet to transfer 50.00 mL of a sodium chloride solution into the beaker and weigh the beaker again to get 80.5678 grams. You boil the salt water, being careful to turn down the heat near the end of the process in order to minimize the amount of 'popping' that occurs. At the very end, you dry the beaker in the oven to make sure the salt is completely dry. After cooling the beaker, you weigh it again and find it to be 29.1234 grams. Calculate the m/v % of the original solution: Calculate the m/m % of the original solution: Calculate the molarity of the original solution: Give one possible reason your answer would be higher than the actual value: Give one possible reason your answer would be lower than the actual value:

## Answers

Mass of empty brakes = 28 - 3456 g Mass of the solution = (80.5678 -28.3456) = 52.22229 Volume of the nation solution = 50mL Mass of Nace=(29.1234 – 28.3456)g 70-7778 9 m/v % in the solution = 0.7778 g x 100%. 50mL 1 Si 5556% 7. - 1.489 4 1. txlogy 52.2222 g 1 3) Molas mass of Nad = 58.44g mole - 0.778 g Nace =- 1. or778 - = 13.484 X10 male 58.44 mole Molarity = 13.484 x 153 mole. xonome - 50mL =10. 2697 molar / 4) Amwer can show higher value if beaker has not been dried properly and for essor involumetric pipet 5 Answer can show lower valve if there is any error in volumetric piper or during weighing .

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