SCIENCE LAB HOMEWORK

UMUC 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: