The pH Scale Flashcards

All 6 cards in this deck

What is the pH of a neutral solution?

What range of pH values do acidic solutions have?

Lower than 7 (pH < 7).

What range of pH values do alkaline solutions have?

Higher than 7 (pH > 7).

True or false? Adding an alkali to dilute hydrochloric acid could change the pH from 1 to 12.

True. The mixture starts acidic and ends alkaline, passing through neutral.

What colour is methyl orange in an acid, and in an alkali?

Red in an acid; yellow in an alkali (it is also yellow in a neutral solution).

What colour is phenolphthalein in an acid, and in an alkali?

Colourless in an acid (and in a neutral solution); pink in an alkali.