Text Box: TYPE YOUR FULL NAME:UMUC NSCI 101/103

Lab 4: Acids and Bases

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image1.emfUMUC NSCI 101/103

Lab 4: Acids and Bases

INSTRUCTIONS:

· On your own and without assistance, complete this Lab 4 Answer Form and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).

· To conduct your laboratory exercises, use the Laboratory Manual that is available in the classroom. Laboratory exercises on your CD may not be updated.

· Save your Lab 4 Answer Form in the following format: LastName_Lab4 (e.g., Smith_Lab4).

· Submit your document in a Word (.doc or .docx) or Rich Text Format (.rtf) for best compatibility.

Pre-Lab Questions:

1. What is a neutralization reaction?

2. Hydrochloric acid (HCl) is a strong acid. About what pH would you expect it to be?

2. Sodium hydroxide (NaOH) is a strong base. About what pH would you expect it to be?

Experiment 1: Acidity of Common Household Products

Table 2: Acid-Base Neutralization for Part 1, Steps 5 & 6

  Test tube 1 Test tube 2 Standard
Step 1 Add acid Add base Neutral
Color      
pH value      

Table 3: Acid-Base Neutralization for Part 1, Steps 8 & 9

  Test tube 1 Test tube 2 Standard
Step 1 Add base Add acid Neutral
Color      
pH value      

Table 4: Acidity and Alkalinity Testing for Household Products Data

Product Hypothesized pH Color of Litmus Paper Color of pH Paper Actual pH
         
         
         
         
         
         
         

Questions

1. Why did the grape juice change color when an acid or base was added?

2. You added a base, sodium bicarbonate, to test tube 1 that contained citric acid and an acid to test tube 2 that contained base. Why did the grape juice return to its original color?

3. Name 2 acids and 2 bases you often use.

TYPE YOUR FULL NAME:

INSTRUCTIONS:

 

·         On your own and without assistance, complete this Lab 4 Answer Form and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).

 

·         To conduct your laboratory exercises, use the Laboratory Manual that is available in the classroom. Laboratory exercises on your CD may not be updated.

 

·         Save your Lab 4 Answer Form in the following format:  LastName_Lab4 (e.g., Smith_Lab4).

 

·         Submit your document in a Word (.doc or .docx) or Rich Text Format (.rtf) for best compatibility.

 

 

 

 

 

Pre-Lab Questions:

 

  1. What is a neutralization reaction?

     

     

     

  2. Hydrochloric acid (HCl) is a strong acid. About what pH would you expect it to be?

     

     

     

 

  1. Sodium hydroxide (NaOH) is a strong base.  About what pH would you expect it to be?

 

 

Experiment 1: Acidity of Common Household Products

 

Table 2: Acid-Base Neutralization for Part 1, Steps 5 & 6

 

  Test tube 1 Test tube 2 Standard
Step 1 Add acid Add base Neutral
Color      
pH value      

 

Table 3: Acid-Base Neutralization for Part 1, Steps 8 & 9

 

  Test tube 1 Test tube 2 Standard
Step 1 Add base Add acid Neutral
Color      
pH value      

 

 

 

Table 4: Acidity and Alkalinity Testing for Household Products Data

 

Product Hypothesized pH Color of Litmus Paper Color of pH Paper Actual pH
         
         
         
         
         
         
         

 

Questions

 

  1. Why did the grape juice change color when an acid or base was added?

     

     

     

  2. You added a base, sodium bicarbonate, to test tube 1 that contained citric acid and an acid to test tube 2 that contained base.  Why did the grape juice return to its original color?

     

     

     

  3. Name 2 acids and 2 bases you often use.

 

 

 

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