Chemistry Experiment: pH Testing and Chemical Reactions

Running head: CHEMISTRY
CHEMISTRY
Name of Student
Institution Affiliation

2
CHEMISTRY
Step 1
Household product Volume of
household product
Volume of
indicator
Observation Estimated
pH
Lemon juice 15mL 5mL Red 2
Tap water 15mL 5mL Purple 7
Egg white 15mL 5mL Green 9
Laundry powder
dissolved in water
15mL 5mL Green 12
White vinegar 15mL 5mL Red 2
Tomatoes 15mL 5mL Blue 6.5
Cottage cheese 15mL 5mL Violet 5
Baking soda solution 15mL 5mL Green 12
Step 2
Baking soda Tap water Vinegar solution

3
CHEMISTRY
Step Substance added Observation
1. Acid solution Cabbage indicator solution Red
2. Neutralization Sodium bicarbonate powder Purple
3. Re-acidification Vinegar Red
Additional Questions
Q1. (a) Lemon juice was the most acidic solution of all the acids in the experiment with a pH
value of 2. Lemon juice contains large quantities of citric which is responsible for the acidity
making the pH to range between 2 and 3 hence it is between 10,000 and 100,000 times more
acidic than water, which is a neutral substance (Stoker, 2012).
(b) Using an estimated pH of 2 for lemon juice, the corresponding hydronium ion concentration
can be estimated as shown below:
+¿ H❑
pH=−log
Replacing the pH with 2
2=
+¿ H❑
−log
Multiplying each sides of the inequality by -1
-2=
+¿ H❑
log
Taking the exponential with base 10 of each of the sides