Experiment 1: Introduction to Chemistry and Analytical Balance

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Experiment 1: Introduction to Chemistry and Analytical Balance

CHEM 1110 EXPERIMENT 1: INTRODUCTION TO THE CHEMISTRY LAB AND USE OF THE ANALYTICAL BALANCE NAME: Objective: To learn the proper use of the analytical balance and the method of weighing by difference, and the calibration of 15.00 mL pipet by pipetting techniques. Procedure: WEIGHING EXERCISE: Weigh approximately 0.5 g of sodium bicarbonate in a small weigh boat on a triple beam balance. Then weigh it accurately on an analytical balance and record its mass. Transfer the sample into a 100.0-mL volumetric flask using a plastic powder funnel. Weigh the boat plus residue on the same analytical balance. Rinse the sides of the funnel with distilled water and then dilute to the 100.0-mL mark with distilled water. Cover the flask with a lid and mix thoroughly. Show your solution to the lab instructor. Data: Mass of boat + NaHCO3 (g) Mass of boat + residue (g) Mass of NaHCO3 (g) CHEM 1110: Introduction Lab KWANTLEN POLYTECHNIC UNIVERSITY SURREY CAMPUS Page 1 PIPETTING EXERCISE Weigh an empty 100-mL beaker on an analytical balance and record its mass. Pipette 15.00-mL of distilled water into the beaker. Weigh the beaker plus water on the same balance. Pipette another 15.00-mL of water into the same beaker and weigh it again. Repeat this process three more times. Data and calculations: Mass of empty 100-mL beaker = ___________________ g Pipetted Mass (g) of beaker Mass (g) of 15.00 mL Deviation from the Volume + pipetted water pipetted water average mass (g) (mL) 15.00 30.00 45.00 Average Mass = Average Deviation = CHEM 1110: Introduction Lab KWANTLEN POLYTECHNIC UNIVERSITY SURREY CAMPUS Page 2 Calculation of Average Volume delivered by 15.00 mL pipette (Use density of water at a given temperature in the lab manual in the introduction lab, to calculate the average volume and average deviation in terms of volume from the mass terms) Volume delivered by 15.00 mL pipette That is : Average volume (mL) ________ Average deviation(mL) ____________ (Remember, average deviation should be based on the number of decimals present in the average volume) CHEM 1110: Introduction Lab KWANTLEN POLYTECHNIC UNIVERSITY SURREY CAMPUS Page 3 .

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