P6 Acids and bases

7. Acids and bases

by Bart Grootswagers

​7.1 Acid and alkalis

​Acid and alkalis can be found nearly everywhere.

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​Acids usually taste sour, sharp or tangy, like a lemon. Be carefull some acids can be very dangerous. They can be corrosive, when dealing with a corrosive acid be mindful of the following symbol:

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​7.1 Acids and alkalis

Many cleaning products are alkali. Like acids a strong alkali can be very dangerous. They can cause chemical burns​.

​An alkali is the opposite of an acid.

Multiple Choice

Acid or alkali?

• Acid

• Alkali

​7.2 Is it an acid or alkali?

Some substances react with acids and alkali and produce different kind of colours. These are called indicators. Red cabbage, blackcurrant and beetroot make great indicators.

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​7.2 Is it an acid or alkali?

Another great idicator is litmus paper.

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​7.3 The pH scale

​The pH scale tells if a substance is an acid or an alkali. The scale goes from 0 to 14, where all numbers smaller than 7 are acids. A substance with a pH of 7 is considered neutral. And any substance above a 7 an alkali.

​Today's assignment

​Found in google classroom.