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Determination of pH
Objectives
· Introduce Ph paper and universal indicator to the students and how
to use pH paper.
· How to measure the liquid substances using pH paper.
· Measure the four different (Soft Drink, H2SO4,
NaOH, and washing soap) liquid pH values and recognize which is base or acidic.
Introduction
pH determination experiment is done
on the solution to determine the number of the solution’s pH; calculating the
molar concentration of hydrogen ions in the solution, the pH scale, often known
as the "power of hydrogen," measures how acidic or basic a solution
is.
Theory
pH paper is used for determining the
acidity and basicity/base. The pH scale range starts from 1 to 14 and there are
less than 7 acidities and more than 7 basicity/base. 7 is neutral (Not acidic or
basicity.). In a solution when the reading is less than 7 that means the H+ ion
is high in solution. When the H+ ion is lower in a solution which is a base solution,
and the reading of pH is higher than 7.
Materials and Equipment
1.
4
Beakers (100 mL)
2.
pH
Paper and Universal Indicators
3.
Soft
Drink
4.
H2SO4
5.
NaOH
6.
washing
soup
Procedure
1.
pour
50ml of the different solutions into the four beakers.
2.
Dip
the PH papers in each beaker of substance and wait for a minute.
3.
Pull
the PH papers out of the beakers and measure the color of the PH.
4.
Put
your results in the table below and indicate whether they represent an acidic
or basic solution.
Results and analysis
The results were that the soft drink
and the H2SO4
solution were acid because the paper changed colors to what was
represented in the pH scale as acid. On the other side, the pH papers that were
dipped in the NaOH solution and washing soup indicated that they were base,
which is shown on the table below.
|
substances |
PH value |
Acid or base |
|
Soft drink |
3 |
ACID |
|
H2SO4 solution |
1 |
ACID |
|
NaOH solution |
13 |
BASE |
|
washing soup |
9 |
BASE |
From the results above we found that the pH; The hydrogen ion
concentration in water is measured using a pH scale ranging from 1.0 to 14.0.
Water becomes increasingly acidic as its pH decreases. The more basic, or
alkaline, water is, the higher its pH.
Conclusion
In the conclusion, we found the pH level of the different solutions by
dipping in them the pH paper and it determined the power of hydrogen in it, on
a scale of 1 to 14, where from 1 to 7 is acid and 7 to 14 is basic and 7 is
neutral.