Add a drop of indicators to the following substances in the table given below and record the change in colour: Sample solution Phenolphthalein Blue Litmus Red Litmus Methyl Orange Hydrochloric acid Sulphuric acid Acetic acid Oxalic acid Sodium hydroxide Sodium carbonate Ammonium hydroxide From the observed facts, write conclusions of the results.

The colour change observed is as follows- Sample solution Phenolphthalein Blue Litmus Red Litmus Methyl Orange Hydrochloric acid No change Red No change Red Sulphuric acid No change Red No change Red Acetic acid No change Red No change Red Oxalic acid No change Red No change Red Sodium hydroxide Pink No change Blue Yellow Sodium carbonate Pink No change Blue Yellow Ammonium hydroxide Pink No change Blue Yellow Phenolphthalein is naturally colourless but turns pink in alkaline solutions and remains colourless in acidic solutions. Blue litmus changes to red in acidic solutions while remain unchanged in basic solutions. Red litmus changes to blue in basic solutions while remain unchanged in acidic solutions. Methyl orange changes to red in acidic solutions and yellow in basic solutions.

E M B I B E

Science for Class 10>Chapter 3 - Acids, Bases and Salt>EXERCISES>Q 5

MEDIUM

10th Manipur Board

IMPORTANT

Earn 100

Device an experimental setup to show that dilute hydrochloric acid is a good conductor of electricity.

Important Questions on Acids, Bases and Salt

MEDIUM

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 3 - Acids, Bases and Salt>Let us answer these>Q 1

Add a drop of indicators to the following substances in the table given below and record the change in colour:

Sample solution	Phenolphthalein	Blue Litmus	Red Litmus	Methyl Orange
Hydrochloric acid
Sulphuric acid
Acetic acid
Oxalic acid
Sodium hydroxide
Sodium carbonate
Ammonium hydroxide

From the observed facts, write conclusions of the results.

EASY

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 3 - Acids, Bases and Salt>Let us answer these>Q 2

Suggest the use of turmeric as an indicator.

EASY

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 3 - Acids, Bases and Salt>Let us answer these>Q 3

Is sodium chloride solution acidic or basic?

HARD

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 3 - Acids, Bases and Salt>Let us answer these>Q 1

Dissolve a small amount of

{NaHCO}_{3}

in the water. Add 1 drop of methyl orange into it. What is the colour of the mixture?
Add lime water in the above solution till the evolution of the gas stops. What is the colour of the mixture now?

HARD

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 3 - Acids, Bases and Salt>Let us answer these>Q 2

How many grams of sulphuric acid