Question

Oxalic addindate CH2OT-2H2 Fill out the table with the appropriate data from Part C, Trial 1 Trial 2 439 Mass of Oxalic Acid Dihydrate (g) Moles of Oxalic Acid Dihydrate (Convert grams of oxalic acid to moles using the molecular weight of oxalic acid dihydrate) Moles of NaOH (Convert moles of Oxalic Acid Dihydrate to moles of NaOH using the mole ratio from the reaction) 25mL 41.6mL 41.35 mL Initial burette reading (mL) 2omL 32.00ML Final burette reading (mL) Volume of NaOH used (L) Molarity of NaOH (Moles of NaOH/Liters of NaOH) Average molarity of NaOH Percent Error (Use the molarity of NaOH from Step 3 of Part B as your theoretical, and the average molarity from above as your experimental) Compare the molarity that you got from Part C to the original molarity of 0.25M. How do the concentrations vary from one another? What factors could account for error between the two concentrations? 1. nutb) i 13 PROCEDURE CHECK ALL GLASSWARE!!! Part A: Preparing a solution of NaOH For this part, you will learn how to prepare 200 mL of a 0.5 M NaOH from solid NaOH 1. Calculate the amount (in grams) of NaOH you will need to make 200 mL of a 0.5 M moles NaOH solution, Moles Molarity 200-1000.2 x.5 Liters Molar Mass of NaOH: 39.919/meles 0.I os 3.119 Moles of NaOH in the 200 mL of solution: Grams of NaOH in the 200 mL of solution: 2. Obtain a 100 mL graduated cylinder and fill to the 50 mL. graduated mark with distilled water. Then pour the water into a 250 mL. beaker 3. Weigh out the exact amount of NaOH solid calculated from Step 1. Add the NaOH to the water in the 250 mL beaker. After the NaOH is added, fill the beaker to the 200 mL graduated mark with distilled water. 4. Obtain a hot plate and a stir bar. Place the NaOH solution on the hot plate and place the stir bar in the beaker. Keeping the stirring speed low, use the hot plate to gently stir the solution until all the solid NaOH is dissolved. Avoid splashing. 5. Once the solid is dissolved, turn off the stirrer. Part B: Diluting the solution of NaOH For this part, you will learn how to dilute the 0.5 M NaOH solution to prepare 200 mL of a 0.25 M NaOH solution. 1. Calculate the needed amount of 0.5 M NaOH (Vi) and water to prepare 200 mL of a 0.25 M NaOH solution 39.9mks 100nl loomL Volume of 0.5 M NaOH to be used MIVI M2V2 Volume of water to be used V2- VI Volume water 2. Obtain a separate, clean 250 mL beaker. Obtain one 50mL and one 100mL graduated cylinders and label them with a wax pencil to keep them separate. One will be used to NaQH and one will be used to measure the water. Do not mix them up. measure 3. Use one of the graduated cylinders to measure out the appropriate volume of water (from Step 1) and pour it into the clean 250 mL beaker. Note: you can use the graduated cylinder several times if the total volume is more than 50mL. 4. Use the second graduated cylinder Step 1) and slowly pour it into the 250 mL that contains just water. Note: you can use the graduated cylinder several times if the total volume needed is more than 50mL 5. Gently swirl the beaker to mix the NaOH solution. C to measure out the appropriate volume of NaOH (from 7 1

Answer 1

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LThecon tieally =O 25 M origmah Makority enpari meatut Mulari ty Vaniation of cone entration weighing of Nao at the ime prepastatiun NaoH ut jom cwroreaus mebe Titration as rnatiny oxdie acil with Nao may not bedone in propot w No oH ution ma be Kept n long tim between upaation omd tithation
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