Acids And Alkalis

Question 1

Give example of alkalis used in labratories

Answer 1

Sodium hydroxide solution

Potassium hydroxide solution

Question 2

How can alkali be corrosive?

Answer 2

If it is concentrated (sometimes even diluted)

Question 3

What compounds do flowers contain that act as indicators

Answer 3

Anthocyanins

Question 4

What flower changes color, and for what soil state

Answer 4

Hydrangeas, blue in acidic, pink in alkaline

Question 5

What is an indicator

Answer 5

Chemical that turns a different colour based on whether it is added to an acid or alkali

Question 6

What is litmus

Answer 6

A commonly used indicator when added to filter paper or used as liquid. Made from lichen which grows on stone and rock.

Question 7

What is acidic conditions

Answer 7

Less than ph 4.5

Question 8

What is alkaline conditions

Answer 8

Higher ph than 8.3

Question 9

What is ph

Answer 9

The measure of acidity of a solution

Ranges from 1-14

Question 10

What is a universal indicator

Answer 10

Range of colours, made from mixture in indicators

Question 11

Why do different soils have different ph level

Answer 11

Made of different rocks, so contain different chemicals. Ph effects nutrient availability

Question 12

Where is the word acids developed from

Answer 12

The word acidus (latin for sour)

Question 13

Where is the word alkali developed from

Answer 13

Al-quliy Arabic for the ashes

Gerber greatest Muslim chemist of all time