Write down everything you notice. Remove test tube from water and allow it to cool for 2 minutes in a small beaker of tap water. Add about 7.0 mL of 1M hydrochloric acid to the tube. Mix chemicals very thoroughly with a stirring rod. Record how long it takes for change to happen.
Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube. Repeat it 2 more times. | The liquid in the boiling tube “R” first starts out clear, and then once we add the acetic acid and swirl, the solution turns a yellow color, to then a brown-red color. The boiling tube
Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube. Repeat it 2 more times. | The liquid in the boiling tube “R” first starts out clear, and then once we add the acetic acid and swirl, the solution turns a yellow color, to then a brown-red color. The boiling tube
The reflux apparatus was place in the aluminum block. The block had been heated around 15 minutes which was to 120-130°C As the mixture was warmed, the white solid that formed was dissolved. The apparatus was lifted out of the aluminum block after a period of heating. Also, the flask was placed under the tap water to cool down the mixture to room temperature. Carefully 0.5mL increments of 3M sulfuric acid was
Remove the test tube from the hot water bath. Turn off the burner. Cool the test tube and its contents for 2 minutes in room temperature water. Add 1.5 M hydrochloric acid to the third mark. Mix with the stirring rod.
SYNTHESIS 3 Purifying an unknown solid by recrystallization involved preparing cobalt amine chloride product. By adding five grams of cobalt II chloride into 20ml of 9M HBR in 250 mL beaker, plus 15 mL of deionized water. Dissolving the compound within pure water, filtration by gravity and adding two grams of activated charcoal and 25 mL of concentrated. Cooled after heating and additional six mL of 30 percent hydrogen peroxide. Filter by suction then collect the dark solid.
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.
The samples don’t have to have the same mass as long as it’s between 0.3 and 0.4g. Add about 20mL of water and 3 drops of phenolphthalein indicator to each sample and allow the solid to dissolve. Prepare a 50mL buret for use by washing it, rinsing it with tap water, and rinsing it twice with distilled water. Finally rinse it twice with 5mL portions of your sodium hydroxide solution. Mount the buret on the ringstand and fill it above the zero mark with the prepared sodium hydroxide solution.
Limiting Reactant Lab Rona Hunter August 31, 2011 Purpose: The purpose of this lab is to determine the limiting reactant in a salt mixture, and to determine the percent composition of each substance in a salt mixture, therefore increasing our understanding of the concepts of limiting reactants, percent composition, and laboratory techniques of heating and filtering precipitates. Procedure: Weigh two samples of about 1.0 g of the salt mixture in separate beakers. Add about 200 mL distilled water, stir, and allow precipitate to settle. Heat the solutions on a hot plate while covered with a watch glass, at 80-90 degrees Celsius for 30 minutes. Allow the precipitate to settle, and heat 30 mL distilled water.
To the second, add 10% NaOH dropwise until the pH is 14. (To do this, add a couple of drops of NaOH to the tube; stir thoroughly with a stirring rod; then touch the stirring rod to a piece of pH paper to check your pH.) To the third, add 0.5% sodium bicarbonate solution to pH 9, and to the fourth, add 2% HCl to pH 2. Record your observations on the data sheet. Repeat the above tests using 2% casein solution.