To determine the pH
of the given
zampley using pH paper or Universal
indicator
what is the aim
Answers
The nature of the chemicals used in laboratories is either basic, acidic or neutral. This characteristic depends on the ions they release. A chemical is said to be acidic if it releases H+ ions in its aqueous solutions. A chemical is said to be basic if it releases OH– ions in its aqueous solutions. In this experiment, we will learn how to find the pH of acids and bases.
Aim:
To determine the pH of the given samples using pH paper or universal indicator. The samples whose pH has to be determined are-
Dilute CH3COOH
Dilute NaOH
Salt NaCl
Dilute NaHCO3
Water
Lemon juice
Materials required:
Six test tubes
Test tube stand
Dilute acid CH3COOH
Dilute base NaOH
Salt NaCl (preparation: dissolve 1 gram salt in 10 mL distilled water)
Water
Lemon juice
Dilute NaHCO3
Glass rod
Measuring cylinder (10 mL)
Standard pH colour chart
pH paper
Glass rod
Dropper
Universal indicator
Theory:
What is pH?
pH is a measure of hydrogen ion concentration to determine the alkalinity or acidity of a solution.
If the pH value of a solution is less than 7 it is an acidic solution
If the pH value of a solution is greater than 7 it is a basic solution
If the pH value of a solution is equal to 7 it is a neutral solution
What is pH scale?
The pH scale consists of values which range from 0 (very acidic) to 14 (very alkaline). The numbers on the scale help to determine the hydrogen ion concentration.
What is pH paper?
pH paper can help us know if a solution is basic, acidic or neutral. When the pH paper is dipped into a solution whose pH has to be determined, a colour will be developed. This colour is compared with the standard pH colour chart. Instead of pH paper, we can also use universal indicator paper or universal indicator solution.
What is universal indicator?
A universal indicator is a mix of pH indicator solutions that are designed to determine the pH of solutions over a wide range of values. Put a drop of solution on the universal pH indicator paper. The colour developed on the paper is matched with the standard pH colour chart.
The nature of the chemicals used in laboratories is either basic, acidic or neutral. This characteristic depends on the ions they release. A chemical is said to be acidic if it releases H+ ions in its aqueous solutions. A chemical is said to be basic if it releases OH– ions in its aqueous solutions. In this experiment, we will learn how to find the pH of acids and bases.
Aim:
To determine the pH of the given samples using pH paper or universal indicator. The samples whose pH has to be determined are-
Dilute CH3COOH
Dilute NaOH
Salt NaCl
Dilute NaHCO3
Water
Lemon juice
Materials required:
Six test tubes
Test tube stand
Dilute acid CH3COOH
Dilute base NaOH
Salt NaCl (preparation: dissolve 1 gram salt in 10 mL distilled water)
Water
Lemon juice
Dilute NaHCO3
Glass rod
Measuring cylinder (10 mL)
Standard pH colour chart
pH paper
Glass rod
Dropper
Universal indicator
Theory:
What is pH?
pH is a measure of hydrogen ion concentration to determine the alkalinity or acidity of a solution.
If the pH value of a solution is less than 7 it is an acidic solution
If the pH value of a solution is greater than 7 it is a basic solution
If the pH value of a solution is equal to 7 it is a neutral solution
What is pH scale?
The pH scale consists of values which range from 0 (very acidic) to 14 (very alkaline). The numbers on the scale help to determine the hydrogen ion concentration.
What is pH paper?
pH paper can help us know if a solution is basic, acidic or neutral. When the pH paper is dipped into a solution whose pH has to be determined, a colour will be developed. This colour is compared with the standard pH colour chart. Instead of pH paper, we can also use universal indicator paper or universal indicator solution.
What is universal indicator?
A universal indicator is a mix of pH indicator solutions that are designed to determine the pH of solutions over a wide range of values. Put a drop of solution on the universal pH indicator paper. The colour developed on the paper is matched with the standard pH colour chart.
pH value chart:
pH value chart
Experimental Setup:
pH of samples
Testing pH using universal indicator paper
Procedure:
Wash six test tubes with distilled water and put them on test tube stand and label them A, B, C, D, E, F.
Add 2ml of CH3COOH in test tube A, Add 2ml of NaOH in test tube B, Add 2ml of NaCl in test tube C, Add 2ml of NaHCO3 in test tube D, Add 2ml of Water in test tube E, Add 2ml of Lemon juice in test tube F.
Take white tile, place 6 pH paper and label them A, B, C, D, E, F.
Use a dropper or glass rod to put the respective sample solutions on the labelled pH paper placed on the white tile.
Observe the colour change.
Explanation:
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