Experimental Procedures and Data Sheet Name: Stephanie Date: section TA Signatur
ID: 519284 • Letter: E
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Experimental Procedures and Data Sheet Name: Stephanie Date: section TA Signature. All data must be written in pen a the time it is collected. Pencil is not allowed to be invalid. Any changes made to the data initialed by your TA or will be considered to be Your TA must sign your data before you leave the lab or data wil be end of the lab This data sheet must be tumed in with your table and your review at the Part 1 Making a Dilution from the 3M Test Solution of solutionsl Ahways use these solutions from this point on in the experiment, not the stock Add 10 mL of distilled water to a 50-mL volumetric 10.00ml of stock solution into the 50-mL 2. Use your 10-mL graduated cylinder to transfer exactly into the water, volumetric flask. Pour slowly and swirl to mix the stock solution 3. Cap the flask and invert to fully mix the solution. the fill ine. 4. Use your wash bottle to fill the to /5. Cap and invert flask to fully mix. Part 2 Making a Standard Solution of Sodium Carbonate sodium carbonate. 1. Carefully weigh out between 0.300 and 0.400 grams of anhydrous /2. Record the exact mass. 0.312 Mass of sodium carbonate: Transfer the solid to a 30mL beaker. Add approximately 10mL of deionized water, Swirl the beaker to mix the contents until ALL of the solid is dissolved. Pour the contents of the beaker into a 25mL volumetric flask. flask. No signs of the 6. Rinse beaker with a few milliters of water and transfer washing into volumetric sodium carbonate solution should be present in the beaker. Use your wash bottle to fill the volumetric flask to the fill line. Cap and invert flask to fully mix. ard of Diluted t Solutio using Phe made in part 1. 1. Use a 100mL beaker to fil the buret with the diluted HCI solution that was flask. Pour your standard solution of sodium carbonate into a 125mL Erlenmeyer A. Add a stir bar to the flask. flask with distilled water to remove any remaining drops of sodium Rinse the 25-mL volumetric the Erlenmeyer flask. solution should tum carbonate solution. Add the washings to solution. Your 5. Add 2 drops of phenolphthalein indicator to the sodium carbonate 6. dark pink. beaker leaving the tip of the buret filled with HCI solution. Release a small amount of HCl into a smallExplanation / Answer
Given
Mass of sodium bicarbonate = 0.342 g
Molar mass of sodium bicarbonate = 84 g/mol
No. of moles of sodium bicarbonate = Mass / Molar mass = 0.342 g / 84 g/mol = 0.004 moles Answer
Given
First titration
Given 1 mole of HCl is used for 1 mole of sodium bicarbonate
No. of moles of HCl = No. of moles of sodium bicarbonate = 0.004 moles Answer
initial buret reading = 1.03 ml
final buret reading = 8.39 ml
Volume of HCl used = 8.39 ml - 1.03 ml = 7.36 ml = 0.00736 L
Molarity of HCl M1 = No.of moles of HCl / Volume of HCl in L = 0.004 moles / 0.00736 = 0.544 mol/L Answer
Volume of this HCl V1 = 20 ml As we have made in first part taking 10 ml water and 10 ml of stock solution
Volume of stock solution V2 = 10 ml given in first part
V1 M1 = V2 M2
M2 * 10 ml = 20 ml * 0.544 M
M2 = 1.088 M Answer
Second titration
1 mole of HCl is used for 1 mole of sodium bicarbonate so for 0.004 moles of sodium bicarbonate
Moles of HCl = 0.004 moles Answer
intial buret reading = 8.39 ml
final buret reading = 14.2 ml
Volume of HCl used = 14.1 ml - 8.39 ml = 5.71 ml = 0.00571 L
Molarity of HCl = No of moles / Volume of HCl = 0.004 / 0.00571 = 0.7 mol/L
Volume of this HCl V1 = 20 ml As we have made in first part taking 10 ml water and 10 ml of stock solution
Volume of stock solution V2 = 10 ml given in first part
V1 M1 = V2 M2
M2 * 10 ml = 20 ml * 0.7 M
M2 = 1.4 M Answer
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