LAB: How are the Scientific Method, Safety, and Measurement Important in Chemistry?

Problem:
How does table salt affect the boiling temperature of water?
Research:
Many cooking recipes give you the instruction of adding salt to the water when boiling something. This can do many things to the water and there must be a special reason why they tell you to add salt to the water. This experiment will show us how salt affects the temperature of boiling water.
SAFETY:
  1. Know how to correctly light a Bunsen burner.
  2. Wear safety goggles throughout the lab.
  3. Tie back long hair when working with open flame.

Hypothesis:
(Make your own hypothesis. Be sure to use an “If….. then….” Format.)
Materials:
salt, water, thermometer, filter paper, matches, sand box, Bunsen burner, ring clamp, tirring rod, ring stand, scoopla, wire gauze, 3 small beakers, beaker tongs, 100mL graduated cylinder, balance beam, calculator
Procedure:
  1. Using the graduated cylinder, measure out 50 mL of water into each of the 3 small beakers.
  2. Heat the 1st beaker to boiling and record the temperature.
  3. Take the mass of a piece of filter paper. Set the balance on 4 grams more than the mass of the filter paper. Add salt to the filter paper using the scooplauntil the arm of the balance evens out. This will ensure that you are using 4 grams of salt.
    4. Add this measured salt to the water in the 2nd beaker and stir.
    5. Heat the 2nd beaker to boiling and record the temperature reached.
    6. Repeat steps# 3—5 using 8 grams of salt and using the 3rd beaker.

Record And Analyze Data:
Temperature of Boiling Water (of the 1st beaker)
Amount of salt added the first time (to the 2nd beaker)
Temperature of boiling water after salt was added (to the 2nd beaker)
Amount of salt added the second time (to the 3rd beaker)
Temperature of boiling water after salt was added the second time (to the 3rd beaker)

CONCLUSIONS:

  1. EXPLAIN how volume, mass, and temperature measurements were each taken throughout the lab. Include in your explanation, what tools were used.
  2. What served as your control in this lab?
  3. What is something else you held constant within the lab (but didn’t necessarily serve as your control)?
  4. What was your independent variable?
  5. What was your dependent variable?
  6. What is your conclusion? (In other words, how did salt affect water’s boiling point?)