Acids and Alkalis

Question 1

What is a base?

Answer 1

A substance that neutralises acid. (Not all bases are alkalis, but all alkalis are bases.)

Question 2

Alkali

Answer 2

A soluble base which produces hydroxide ions in aqueous solutions. OH-

-Bitter taste
-Feels slippery
-ph 7< (8-14)
-Does not corrode with metals
-Does not react with metals to create hydrogen gases and produce a compound.
-Turns litmus blue.

Question 3

Acid

Answer 3

A substance that donates (protons) hydrogen ions in aqueous solutions. (H+)

-Sour taste
-Does not feel slippery
-Ph <7 (0-6)
-Corrodes metals
-Reacts with metals to produce hydrogen gases
-Turns litmus pink/red.

Question 4

pH 7

Answer 4

Neutral

Question 5

Neutralisation

Answer 5

Occurs (reaction) when the acidic and alkaline ions cancel each other out.

H+ OH- -> Hv2O (l)

Question 6

How do we measure acidity?

Answer 6

-Using an indicator. I.E Phenol red, thymol blue.
-Universal indicator gives a measure of the amount of hydrogen ions present in a solution.

Question 6

How do we measure acidity?

Answer 6

-Using an indicator. I.E Phenol red, thymol blue.
-Universal indicator gives a measure of the amount of hydrogen ions present in a solution.