Lab Neutralization
Problem: How does an antacid neutralize stomach acid?
Background:
1. Define neutralization.______________________________________________
Reaction between an acid and a base to produce a salt and water
2. Draw arrows showing how the products of this neutralization reaction are
formed:
NaOH +
HCl
--------
NaCl
+
H2O
3. What product is always produced in a neutralization reaction?_____H2O_____
Hypothesis:
If antacids are added to stomach acid,
Then ________________________ will neutralize the stomach acid the best.
Data:
Hydrochloric
acid
Rolaids
pH __0_____ pH ______=
Analysis Questions:
Alka Seltzer
pH _______ =
D&G
pH ________=
Tums
pH ______=
1. What acid is in the stomach?___hydrochloric acid____________________
2. How does an antacid work?_______________________________________
The antacid contains a base which captures the H+ from the
hydrochloric acid and changes the pH. (neutralizes the acid)
3. What happens to the pH of the acid in a neutralization reaction? ____________
The pH of the acid starts increasing and heading toward pH 7
which is completely neutral. _
4. In your class which antacid was the best? _______________________________
5. Explain__________________________________________________________
___The average pH was closest to a neutral pH 7.
________________________________________________________________
6. In all the classes which antacid was the best?___________________________
7. Why?____________________________________________________________
This antacid neutralized the stomach acid the best by changing
the pH from 1 to the pH ____ closest to neutral pH 7.
Hydrochloric
acid
pH ___0____
Rolaids
pH ___5____=
Hydrochloric
acid
pH _______
Tums
pH __4____ = pH __3____=
Rolaids
pH
__6____
pH _______
pH ___6_____=
Hydrochloric
acid
pH _______
Hydrochloric
acid
Rolaids
pH ___7_____
=
Rolaids
pH ________=
Rolaids
Alka Seltzer
4
D&G
=
Hydrochloric
acid
D&G
pH ___3_____
=
D&G
pH _________
=
Alka Seltzer
pH _________=
Alka Seltzer
pH _________=
D&G
pH ________=
D&G
4
pH _______
Totals
pH ________=
pH _________=
pH =
pH =
pH ________=
pH= pH