Acids And Bases Lab Chemistry Worksheet With Answers

Acids And Bases Lab Chemistry Worksheet With Answers - Science 10 Page 2

Chemical 4 (acid)

no change

turned red

Questions

1) List the properties of acids and bases

Properties of bases:

Properties of acids:

Tastes bitter (NEVER taste lab chemicals)

Tastes sour (NEVER taste lab

chemicals)

Feels slippery (NEVER touch lab chemicals with

Often is aqueous

bare skin)

Will burn skin

Turns red litmus paper blue

Turns blue litmus paper red

Does not react with some metals ex. Zinc

Corrosive

Has >7 pH

Has <7 pH

Makes OH

when dissolved in a solution

Makes H

when dissolved in a

solution

2) Explain the use of litmus paper (red and blue) as an indicator in identifying acids and

bases

ANSWER: The litmus paper is an indicator as to if the substance is a base/acid, because

when a substance is an acid, it will turn blue colored litmus paper red, and when a

substance is a base, it will turn red colored litmus paper blue.

3) Elaborate on your findings in this lab: were the 4 unknown fluids acids or bases?

ANSWER: One chemical was a base, one chemical was an acid, one chemical was neutral,

and the last chemical was a weak base (turned litmus paper blue over time, though sample

might have been neutral and contaminated with a base.)

4) What other indicators might you use to determine more accurately the pH of the

unknown?

ANSWER: Some other indicators that might more accurately find the pH of an unknown

substance, is to use a pH indicator paper and a chart listing the colors and what pH they

are.

Conclusion: This lab showed how to test a chemical’s pH level when using colored litmus

paper. My group found that of the four substances tested, there was 1 base, 1 acid, 1

neutral, and 1 weak base/neutral (due to possible contamination.)

Acids And Bases Lab Chemistry Worksheet With Answers - Science 10 Page 2