chemical reactions - acids and alkalis

Question 1

letters for acid in a formula

Answer 1

aq = aqueous

Question 2

what do acids produce in aqueous solutions?

Answer 2

hydrogen ions (H+)

Question 3

what is a base?

Answer 3

chemicals that can neutralise acids producing a salt and water. usually they are metal oxides or hydroxides. they are insoluble in water

e.g copper oxide, iron (III) hydroxide

Question 4

what is an alkali?

Answer 4

it is soluble in water

Question 5

In aqueous solutions, what do alkalis produce?

Answer 5

hydroxide ions (OH-)

Question 6

what is sodium hydroxide?

Answer 6

a base and alkali

Question 7

what does the ph scale measure?

Answer 7

the acidity or alkalinity of a solution

Question 8

what is the ph of an acid? neutral? alkali?

Answer 8

acid: 0-6
neutral: 7
alkali: 8-14

Question 9

what is used to determine the ph of a solution?

Answer 9

pH probe or universal indicator

Question 10

how does a ph probe work?
how does universal indicator work?

Answer 10

1. electronically
2. changes colour depending on ph
   green=neutral
   red-yellow=acidic
   blue-purple=alkali

Question 11

what happens when an acid and alkali react?

Answer 11

the hydrogen ions and hydroxide ions produce water

Question 12

what is the neutralisation equation?

Answer 12

H+ + OH- -> H20