Acids And Bases 1

Question 1

What is an indicator?

Answer 1

An indicator shows by means of a colour change nether a substance is acidic or basic e.g. Litmus and Methyl Orange

Question 2

What colour do acids turn litmus?

Answer 2

Acids turn litmus blue

Question 3

What colour do bases turn litmus?

Answer 3

Bases turn litmus red

Question 4

Name some acids

Answer 4

Hydrochloric Acid in the Stomach; Citric Acid in Acid Drops; Formic Acid in Nettle Stings.

Question 4

What are alkalis?

Answer 4

Alkalis are bases that dissolve in liquid e.g. Sodium Hydroxide

Question 5

What is a neutral substance?

Answer 5

A substance that is neither an acid or a base. The litmus turns green in neutral substances e.g. Water

Question 6

What is litmus paper?

Answer 6

Litmus paper is absorbent paper soaked in litmus solution and dried

Question 7

What is the pH scale?

Answer 7

A special scale marked from 0 to 14 which measures the acidity and basicity of acids and bases. A solution whose pH is 7 is neutral, a solution whose pH is less then 7 is acidic and a solution whose pH is greater then 7 is alkaline. The lower the pH is the more acidic a substance is and the higher the pH is, the more alkaline it is.

Question 8

What is a pH sensor?

Answer 8

A pH sensor is used to find the pH of a substance. It is attached to a dialogue and tells us the exact pH of a substance.

Question 9

What is universal indicator paper?

Answer 9

Universal Indicator is a mix of different indicators. A few drops of universal indicator is placed in a substance and the colour is measured on a set o colours.