Question

Who ever will answer this will get 90 points straight and mark as a Brainliest

Answer 1

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.