Question

name of indicators used to examine whether a substance is acidic or alkaline in laboratory
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Answer 1

Answer:

Indicators

When an acid is dissolved in water we get an acidic solution. When a base dissolves in water it is an alkali and makes an alkaline solution. If a solution is neither acidic nor alkaline it is neutral. Pure water is neutral, and so is paraffin.

Indicators are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.

Litmus

Litmus indicator solution turns red in acidic solutions, blue in alkaline solutions, and purple in neutral solutions.

Litmus paper comes as red litmus paper and blue litmus paper. The table shows the colour changes it can make:

Acidic solution

Stays redTurns red

Neutral solution

Stays redStays blue

Alkaline solution

Turns blueStays blue

Blue litmus paper is dipped in a beaker of acid and turns red.

Acids turn blue litmus paper red

Red litmus paper is dipped in a beaker of alkali and turns blue.

Alkalis turn red litmus paper blue

Other indicators

The table shows the colour of methyl orange and phenolphthalein in solutions of different pH:

Methyl orangeRedYellowYellow

PhenolphthaleinColourlessColourlessPink

Explanation:

HOPE IT HELPS.......

Answer 2

Answer:

LITMUS INDICATOR SOLUTION

Explanation:

litmus indictor solution turn red in acidic solutions and  blue in alkaline solutions. it turn purple in neutral solutions. litmus paper is usually more reliable, and come as red litmus paper and blue litmus paper.