16 Jun UMUC NSCI100 lab 4
INSTRUCTIONS:
· On your own and without assistance, complete thisLab 4Answer Form and submit it via theAssignments Folder by the date listed on yourCourse Schedule (underSyllabus).
· 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 yourLab 4Answer 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.
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