Download lab Starter - Virtual Homeschool Group

Name:
Instructor: Tammy Moore
Class: VHSG Chemistry
Date:
EXPERIMENT 3.1
The Conservation of Mass
Investigation of the experimental values related to the conservation of mass.
Introduction
[What you will put here: In this introduction, some background is provided for the reader
(sources are noted in the reference section at the end of the report).Typically, the introduction states the
problem to be solved or the experiment to be performed and explains its purpose and significance. It
also provides whatever background theory, previous research, or formulas the reader needs to
understand to perform the experiment (or solve the problem).]
Methods and Observations
Materials

A 100-mL beaker

Small pot for boiling water

1 250-mL beaker

Measuring cup

Watch glass

Stove

Teaspoon

Mass scale

Lye

Stirring rod

White Vinegar

Safety goggles

Several leaves of red cabbage

Rubber cleaning gloves

Water
Procedures:
I put two cups of water into the pot with cabbage leaves. I then boiled the leaves for 5 minutes.
I used my mass scale to measure the mass of my 100 mL beaker. I then added 60 mL of vinegar to the
beaker.
With my gloves on, I measure out a teaspoon fo lye and put it on the watch glass. After 5
minutes of boiling the cabbage, I allowed it to cool for a few minutes. I then poured about 50 mL of
the solution in the pot into the 250-mL beaker. I allowed the solution in the 250-mL beaker to cool.
Once cool enough to handle, I poured about 10 mL of the solution into the 100-mL beaker. The vinegar
in the beaker turned pink. This is due to chemicals (anthocyanins) that come from the cabbage leaves.
I then placed the stirring rod in the beaker so that it stood in the beaker. I then placed the watch
glass on top of the beaker so that it covered the mouth of the beaker. I placed the beaker with the
stirring rod and watch glass covering it on the scale and measured the mass of the total assembly.
After measuring the total mass, I dumped the lye into the vinegar and stirred the solution with
the stirring rod. I made sure the stirring rod stayed in the solution. The liquid changed colors
Rest the stirring rod in the beaker and keep the watch glass covering the beaker. Measuring the
mass. I touched the sided of the beaker and it seemed warmer than when I started.
I then cleaned up.
Add picture of set up here:
Conclusion