Water Solubility Lab

1. Gathered all required materials to designated lab bench. 2. Considered all safety precautions including the prevention of spilling water to avoid falls, handling glassware carefully to prevent shattering, avoiding long periods of working with warm water to avoid burns and avoiding the digestion/inhalation of by-products produced after the reaction (e.g. ethanol and carbon dioxide gas). 3.

Pour approximately 50 mL of room-temperature distilled water into the glass beaker by using the estimated volume on the beaker.

If the temperature of the water increases, the dissolving time of the Alka-Seltzer tablet will decrease. This is because molecules of warmer water contain more energy than molecules of cooler water. The extra

9) Trial E: Remove the syringe and empty the beaker. Add a Thermometer to the beaker. Add 200 mL of Room Temperature water to the beaker and heat with a Bunsen Burner until it reaches 100° C. Remove the Bunsen Burner. Repeat Steps 5 & 6.

Step 3: Use the thermometer to identify and record the temperature for room temperature, in your refrigerator, in your freezer, and then research the temperature of boiling water (do not take this temperature) and record them in Table 2.

9. Dump out the water in your beaker in the sink, then go to the supply cart and pour vinegar into the beaker. Go back to your lab station.

B. While heating two different samples of water at sea level, one boils at 102°C and one boils at

seltzer tablet into it, and as I did so I started the timer. When Alka

In experiment two, “Hand-soaking,” I took the remainder of the salt water solution, which was approximately one cup and placed it into a cereal bowl. Into a second cereal bowl, I placed one cup of tap water solution. I placed one of my hands into the salt water solution and the other hand into the tap water solution. I let my hands soak in each of the solutions for 30 minutes and then observed the

29. When the thermometer reads 40°C, carry the beaker out of the heating apparatus with a beaker tong.

I believe that when the water temperature increases the dissolving rate would increase whereas when the temperature of the water decreases the dissolving rate would decrease.

* a. A 100.-g sample of water is placed in an insulated container and allowed to come to room temperature at 21ºC. To heat the water sample to 41ºC, how much heat must you add to it?

After reading the lab instructions - but before starting the lab - record your best “educated guess” about what will happen in the experiment. What hypothesis can you generate about the effect of adding salt to water?

Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.

b) An empty beaker was weighted. Then, water was filled in the beaker. The temperature was recorded at uniform intervals.