General Lab Safety - Lab Work PDF

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General Lab Safety PRE-LAB QUESTIONS 1. What should you always wear to protect your eyes when you are in a laboratory? Safety Goggles

2. Should you add acid to water or water to acid? Add acid to water

3. Where should you dispose of broken glass? Use a broom and dust pan to pick it up and place it into a protective container then into the trash can.

4. What should you do if you spill a chemical on your hand? Remove gloves and wash hands thoroughly.

5.

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General Lab Safety EXERCISE 1: NEUTRALIZATION Data Sheet Table 2: Initial pH Test Results Container

Chemical Contents

Initial pH

A

Water

7

B

HCl

1

C

NaCO3

9

Additional Observations Small amount of water for a high pH More amount of liquid for a lower pH The most amount of liquid for the highest pH

Table 3: Neutralization of Acid Total Amount of NaHCO3 Added

Beaker C pH after adding acid

0.5 (initial solution)

4

1.0

5

1.5

7

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General Lab Safety Exercise 1 Post-Lab Questions 1. Most of the chemicals included in your kit can be discarded down a drain with copious amounts of water. Describe a situation in which you would need to neutralize a chemical before discarding down a drain. When a acid has been used during the experiment.

2. Why should you add acid to water rather than add water to acid when preparing solutions? Acids and bases react to each when not mixed properly causing a neutralizing pH reaction.

3. At what point was the solution in beaker C neutralized? When the baking soda was poured into it.

4. Address the following scenarios:

a. If a more concentrated initial solution of sodium bicarbonate was used in beaker C, would it require more or less bicarbonate to neutralize the acid? Why? Less. It was already being diluted so the more you go the less solution will be needed for dilution.

b. If a less concentrated initial solution of sodium bicarbonate was used in beaker C, would that solution require more or less bicarbonate to neutralize the acid? Why? More. The solution was not strong enough for such a little amount to neutralize the acid.

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