II. Procedure Use a 10-mL graduated cylinder to put 6mL of 6 M sodium hydroxide solution (NaOH) into a clean 500mL storage bottle. Use a 100mL graduated cylinder to add 345mL of distilled water to the plastic bottle. Place a lid on the bottle and mix by shaking repeatedly. Sit the bottle off to the side for later use.
Then 5 and 10 grams of salt were weighed using the weighing cup and the scale. The weighing cups of salt were poured into beakers B and C. B receiving 5 grams and C receiving 10 grams. As the hot plate was warming up the salt was stirred in using the stirrer. When the hot plate was ready to go we placed beaker C (with 10 grams of salt) onto the hot plate. Once it started boiling the temperature was taken and it was 102 degrees Celsius.
In this experiment, the salicylic acid is insoluble in cold water and can be collected by vacuum filtration. Procedure As the lab, synthesis of salicylic acid, had done, micro-scale was used. To begin, 3.5mL of water was poured into a 10 mL round-bottomed flask. And 0.48 g of sodium hydroxide was added to the flask. After the solid was dissolved, 230mg of methyl salicylate was added using a graduated pipet to the NaOH solution.
Steps 1-10 were repeated using Copper (II) Sulfate and sodium hydroxide solution Part B: 12. 5 ml of hydrochloric acid was poured into the larger test tube. 13. One scoop of sodium bicarbonate was put into the beaker 14. The test tube was placed in the beaker and the total mass of the reactants, test tube and beaker were determined using the balance.
Now to begin, pour 50 mL of the sodium phosphate buffer solution with a pH of 6.84 into the 150 mL beaker. From here on out, the sodium phosphate buffer solution will be referred to as simply the buffer solution. Next, locate the indicator called bromothymol blue (0.04%) and add 20 drops to your 150 mL beaker. The solution should then appear green. Next, obtain a 5 mL serological pipet and thoroughly rinse it with the buffer solution, then discard the buffer solution into the 250 mL beaker.
Pour 10 ml of 12 M HCl into 30 mL beaker and dilute to 3M 4. Weigh out 5 g of unknown carbonate sample 5. Record amount of carbonate sample 6. Transfer sample of unknown carbonate into Erlenmeyer flask. Be careful to ensure that sample of carbonate does not land outside of Erlenmeyer flask.
A cuvette block, four cuvettes, three 50 mL beakers, one 150 mL beaker, and one 5mL pipet were obtained. The phosphate buffers NaH₂PO₄ and Na₂HPO₄ were procured weighing .4060g and .4106g respectively. The phosphate buffers were then transported to the 150mL beaker. Next 50mL of distilled water was measured using a graduated cylinder and added to the 150mL beaker. Twenty drops of bromothymol blue was also added to the 150mL beaker.
An aqueous solution of ammonium sulfate is allowed to react with an aqueous solution of lead(II) nitrate. Identify the solid in the balanced equation. A) (NH4 )2 SO4 B) Pb(NO3 )2 C) PbSO4 D) NH4 NO3 E) There is no solid formed when the two solutions are mixed. ____ 11. An aqueous solution of sodium carbonate is reacted with an aqueous solution of calcium chloride.
Materials and Methods To begin, .4001 grams of Na2HPO4 and .4081 grams of NaH2PO4 solid was added together into a clean, dry 150 mL glass beaker. Then, approximately 50 mL of distilled water was added to the mixture, and the phosphate solids were stirred until fully dissolved. The last ingredient added to the beaker was exactly 20 drops of the liquid .04% bromothymol blue solution. Using the Vernier pH probe, the initial pH of this soluton was found to be 7.10. After obtaining three clean, dry 50mL glass beakers (Labeled one of each “yellow,” “blue,” and “green.”) approximately 5.00 mL of the solution from the 150mL beaker was added to all three with a volumetric pipet.
Objective The purpose of this experiment was to become familiar with the ability to reproduce an experiment several times. Experimental Materials 1 x Magnetic Stirring Bar (yellow) 2 x 100 mL Flask 8 x 50 mL Erlenmeyer flask Magnetic Hotplate Glass Stirring rod Distilled water Pipet (with Pump handle) Starch 0.20M Ammonium Persulfate (NH4)2S2O8 0.20M Ammonium Sulfate (NH4)2S2O4 0.20M Potassium Nitrate (KNO3) 0.20M Potassium Iodide (KI) 1.2 x 10-2M Sodium Thiosulfate (Na2S2O3) Experimental Method 1. All materials were obtained from the classroom. 2. The flasks were thoroughly cleaned with distilled water.