4.2 Reactions of Acids

Question 1

Write out the word equation for the reaction between acids and metals

Answer 1

Acid + Metal -> Salt + Hydrogen

Salt means the metal salt e.g. NaCl

Question 2

What is a redox reaction?

Answer 2

Reduction Oxdiation reaction

One subtanced reduced and another oxidised

Question 3

Write out the half equations for the Redox reaction
2HCl + Mg -> MgCl2+ H2

Answer 3

Mg is group 2 therefore we know it loses 2 electrons

Chlorine is group 7 therefore we know it gains 1 electron

Mg-> Mg2+ + 2e-

2Cl-> 2Cl- + 2e-

Question 4

What are acids neutralised by?

Answer 4

Alkalis

Question 5

What is the difference between an alkali and a base?

Answer 5

Alkali
Soluble metal hydroixdes

Bases
Insolbule metal hydroxides and metal oxides

Question 6

Write out the word equations for reactions between acids with alkalis and acids with bases

Answer 6

acid + alkali -> salt + water

acid + base -> salt + water

Question 7

What happens when metal carbonates are added to acids?

Answer 7

Acid + Metal carbonate -> Salt + Water + Carbon dioxide

Question 8

What do acids produce in aqueous solutions?

Answer 8

H+ ions

Question 9

What do alkalis produce in aqueous solutions?

Answer 9

OH- ions

Question 10

What do the following pHs mean?

pH 7

pH < 7

pH > 7

Answer 10

7= neutral

Under 7 - acidic

Greater than 7 is alkaline

Question 11

What is the ionic equation for any neutralisation reaction?

Answer 11

H+(aq) + OH-(aq) -> H2
O(l)

Question 12

What is the equation for moles in relation to volume?

Answer 12

n= C x V

Question 13

What is a strong acid?

Answer 13

Completely dissociates in aqueous solution

Question 14

What is a weak acid?

Answer 14

Only partially dissociates in aqueous solution

Question 15

What happens to the concentration of H+ ions as pH decreases by one unit?

Answer 15

As pH decreases by one unit

The concentration of H+ increases by a factor of 10