Acids and Bases: the pH scale

If an acidic solution is concentrated it means there are...

• Many particles of the acid in the solution

• Very few particles of the acid in the solution

A property of acids (e.g. lemon juice) is that they have a particular taste.

How do acids taste?

• Sweet

• Salty

• Bitter

• Spicy

Solution A contains 20g of a base dissolved in 250cm³ of water.

Solution B contains 25g of the same base dissolved in 500 cm³ of water.

Which solution is more concentrated?

• Solution A

• Solution B

The diagram shows the colour of phenolphthalein in different pH's

You add a few drop of phenolphthalein indicator to a colourless solution. You observe the solution turning pink. You think the solution is...

• Acidic

• Neutral

• Basic

Which one of these options will help you determine the most accurate pH of a sample?

• Universal Indicator

• A pH meter

• Red litmus paper

Which on of these substances is a base?

• Vinegar

• Bleach

• Hydrochloric acid

• Water

A pH meter is a type of indicator

• True

• False

Lots of strong acids and bases are corrosive. What symbol is used to warn that a substance is corrosive?

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