SCIENCE LAB HOMEWORK

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

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

Table 4: Acidity and Alkalinity Testing for Household Products Data

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.