TESTING pH LEVEL
TESTING pH LEVEL
BY
Dra. RAYA DEWI
B
STANDARD OF COMPETENCE
UNDER STANDING ACID–BASE SOLUTION PROPERTIES,MEASUREMENT
METHOD AND ITS APPLICATION
BASIC COMPETENCE
DESCRIBING ACID-BASE THEORY BY
DETERMINATION OF SOLUTION PROPERTIES AND CALCULATE pH of
solution
AIM


Determining the pH of solution drinks using pH
meter.
Comparing the results of pH measurements
using a universal indikator with a pH meter.
APPRATUS / CHEMICALS
 APPRATUS
CHEMICALS
 pH meter
Aquadest
Soda
Soap sirih liquid
Pocari sweat
Kiranti
Vit.A.IPI
Vit. Lemon
Cofee and Tea
 12 beaker 200 ml size
 2 beaker 400 ml size
 pH meter
 Test tube


PROCEDURES
1. Reconstituted various beverages and chemicals frequently
used in 50 ml beaker.
2. pH estimated using the universal indikator of acid – base.
3. pH is determined using a pH meter.
Note : Before measuring the pH electroda was immersed in
the buffer or aquades.
THE RESULT OF EXPERIMENT
USING THE UNIVERSAL INDICATOR
 USING A pH METER
TEA
: pH
= 7

TEA
: pH = 5
VIT. LEMON
: pH
= 4

VIT. LEMON
: pH = 3,04
POCARI SWEAT
: pH
= 4

POCARI SWEAT
: pH = 4,9
COFEE
: pH
= 5

COFEE
: pH = 5
KIRANTI
: pH
= 4

SOAP SIRIH LIQUID: pH = 13,79

SODA
SOAP SIRIH LIQUID : pH
= 9
SODA
: pH
= 9
VIT. A . IPI
: pH
= 8
: pH = 8,58
CONCLUSION

BY USING pH - METER ,WE CAN FIND THE INFORMATION OF
pH DIRECTLY BY A DIGITAL SCREEN ON THE INSTRUMENT.

BUT, BASICALLY, MEASURING pH USING THE UNIVERSAL
INDICATOR CAN GIVE A MEASUREMENT RESULT WHICH IS
MORE PRECISE.
PROCESS SKILL

READING SCALE

MEASURING pH

INTERPRATE OF THE DATA