NSCI100 lab 4

Question # 00266233 Posted By: neil2103 Updated on: 04/29/2016 11:01 PM Due on: 04/30/2016
Subject Biology Topic Biochemistry Tutorials:
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Lab 4: Acids and Bases

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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