pH Scale and Indicators Flashcards

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What does the pH scale show?

The pH scale shows how acidic or alkaline a solution is.

What is the range of the pH scale in chemistry?

The pH scale usually runs from 0 to 14.

What pH value is neutral?

A neutral solution has a pH of 7.

What pH values show an acidic solution?

Acidic solutions have pH values less than 7, from 0 to 6.

What pH values show an alkaline solution?

Alkaline solutions have pH values more than 7, from 8 to 14.

Where on the pH scale are strong acids and strong alkalis?

Strong acids are near pH 0, and strong alkalis are near pH 14.

What is an indicator in chemistry?

An indicator is a dye that changes colour in acids and alkalis.

What is universal indicator used for?

Universal indicator is used to estimate the pH of a solution from its colour.

What are the main universal indicator colours from strong acid to strong alkali?

Strong acid is red, weak acid is orange or yellow, neutral is green, weak alkali is blue, and strong alkali is purple.

How does litmus paper show if a solution is acidic or alkaline?

In acid, blue litmus turns red. In alkali, red litmus turns blue.