ZJ_Acid-Base+Lab+Worksheet_

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Name: Date: Acids, Bases, and pH Buffers Lab Worksheet Part One: Test for Acidic and Basic Solutions: Litmus Test Lab Data Results: 1. Record the following data (use the pH Indicator Chart as needed) (.5 points/each) : Experiment Litmus Paper Used (Red/Blue) Initial Color Final Color Acidic or Alkaline? One: Oranges Two: Apple Two: Soap Three: Unknown Solution #1 Four: Unknown Solution #2 Five: Soil Sample A Five: Soil Sample B Lab Data Analysis 1. In at least 3 well-constructed sentences, explain the importance of knowing the pH levels in soil. (4 points) Remember: You may use your pH Indicator Chart and pH Scale located in the Procedure section of the lab.

2. What does it mean when red litmus paper is used to test a sample, but no color change is observed? (2 points) Part Two: Test for Acidic and Basic Solutions: Methyl Orange Lab Data Results: 1. Record the following data (use the pH Indicator Chart as needed) (6 points) : Unknown Solution Initial Color Final Color (after addition of methyl orange) Name of Solution #1 #2 Lab Data Analysis 1. What is the general pH range for Unknown Solution #1? You may use your pH Indicator Chart if needed. (3 points) 2. What is the general pH range for Unknown Solution #2? You may use your pH Indicator Chart if needed. (3 points) (continue below)

Part Three: Test for Acidic and Basic Solutions: Phenolphthalein Lab Data Results: 1. Record the following data (use the pH Indicator Chart as needed) (6 points) : Unknown Solution Initial Color Final Color (after addition of phenolphthalein) Alkaline Solution? (Yes/No) #1 #2 Lab Data Analysis 1. What is the general pH range for Unknown Solution #1? You may use your pH Indicator Chart if needed. (3 points) 2. What is the general pH range for Unknown Solution #2? You may use your pH Indicator Chart if needed. (3 points) Part Four: pH Buffer Experiment Lab Data Results: 1. Record the following data (use the pH Indicator Chart as needed) (6 points) : Solution Initial pH Final pH (after addition of NaOH) Change in pH Unbuffered HCl Buffered HCl

Lab Data Analysis 1. What is the pH of the sodium hydroxide that was added to the unbuffered and buffered hydrochloric acid? Using the pH Scale, is it a strong base, weak base, strong acid, or weak acid? (2 points) 2. What buffer was used to prevent a significant pH change in the hydrochloric acid? Was this buffer effective? How so? (3 points) General Concepts pH 1. What does pH specifically measure? (4 points) 2. When using pH indicators, what is the most accurate method to use to find a specific pH? (2 points) 3. What is litmus? (3 points) 4. Before a pH meter can be used, explain what must first happen. (4 points)

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