Need help with UMUC NSCI 101/103 Acids and Bases UMUC NSCI 101/103 Lab 4: Acids
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Need help with UMUC NSCI 101/103 Acids and Bases
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:
What is a neutralization reaction?
Hydrochloric acid (HCl) is a strong acid. About what pH would you expect it to be?
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
Why did the grape juice change color when an acid or base was added?
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?
Name 2 acids and 2 bases you often use.
Test tube 1
Test tube 2
Standard
Step 1
Add acid
Add base
Neutral
Color
pH value
Explanation / Answer
Neutralization reaction is reaction between an acid and base
HCl is strong acid ans its pH will be 0 to 7 depending upon the concentrations.
pH of NaOH will be between 7 to 14 depending upon its concentration.
grape juice contains citric acid and reacts with the base added giving rise to neutralization and change in color.
sodium bicarbonate is a wek base and reacts with acid to form salt. But when strong acid HCl is added, the reverse reaction takes place leading to retaining the color of the acid.
Acids : HCl , HNO3 ( Nitric acid)
Bases: NaOH. Na2CO3( Sodium carbonate)
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