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TESTING pH LEVEL

TESTING pH LEVEL

BYDra. RAYA DEWI

BASIC COMPETENCE

DESCRIBING ACID-BASE THEORY BY

DETERMINATION OF SOLUTION PROPERTIES AND

CALCULATE pH of solution

STANDARD OF COMPETENCE

UNDER STANDING ACID–BASE SOLUTION PROPERTIES,MEASUREMENT METHOD AND ITS APPLICATION

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 12 beaker 200 ml size Soda 2 beaker 400 ml size Soap sirih liquid pH meter Pocari sweat Test tube Kiranti

Vit.A.IPI Vit. Lemon Cofee and Tea

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.

PROCEDURES

THE RESULT OF EXPERIMENTUSING THE UNIVERSAL

INDICATOR

TEA : pH = 7

VIT. LEMON : pH = 4

POCARI SWEAT : pH = 4

COFEE : pH = 5

KIRANTI : pH = 4

SOAP SIRIH LIQUID : pH = 9

SODA : pH = 9

VIT. A . IPI : pH = 8

USING A pH METER

TEA : pH = 5

VIT. LEMON : pH = 3,04

POCARI SWEAT : pH = 4,9

COFEE : pH = 5

SOAP SIRIH LIQUID: pH = 13,79

SODA : 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