Acidic and alkaline solutions

Question 1

What range of pH do acidic solutions have?

Answer 1

pH less than 7

Question 2

what do acids produce in aqueous solutions?

Answer 2

Hydrogen

Question 3

What do alkaline produce in aqueous solutions?

Answer 3

Hydroxide ions

Question 4

What pH range do alkali solutions have

Answer 4

pH greater than 7

Question 5

If red litmus paper stays red when used to test What solution is it?

Answer 5

Acidic or neutral

Question 6

if red litmus paper turns blue when used to test. What solution is it?

Answer 6

Alkaline

Question 7

If blue litmus paper turns red what solution is it?

Answer 7

Acidic

Question 8

if blue litmus paper stays blue what solution is it?

Answer 8

neutral or alkaline

Question 9

What is a base

Answer 9

A base is any substance which reacts with an acid to form a salt and water only
A example of a base is metal oxide or metal carbonate
Some bases can be soluble and we call these alkalis

Question 10

Explain why all alkalis are bases, but not all bases are alkalis

Answer 10

A alkali is a soluble base, but only some bases are soluble in water.

Question 11

What is a neutralisation reaction

Answer 11

A reaction between a base and a acid

Question 12

When you react a metal with a acid what products do you get

Answer 12

Salt and hydrogen

Example : 2HCl+Mg-» MgCl2+H2

Question 13

When you react a metal oxide with an acid what products do you get?

Answer 13

Salt and water

Example : H2SO4+CuO-»CuSO4+H2O

Question 14

When you react a metal carbonate with an acid what products do you get

Answer 14

Salt, water and carbon dioxide

Example : 2HCL+CuCO3-»CuCl2+H2O+CO2

Question 15

Name some of the elements with a charge of +1

Answer 15

Potassium (k+)
Sodium (Na+)
Lithium (Li+)

Question 16

Name some of the elements with a charge of +2

Answer 16

Magnesium (Mg2+)
Calcium (Ca2+)
Copper (Cu2+)
Iron (Fe2+)

Question 17

name some of the elements with a charge of +3

Answer 17

Aluminium (Al3+)

Iron (Fe3+)

Question 18

Name some of the elements with a charge of -1

Answer 18

Chloride (Cl-)
Bromide (Br-)
Iodide (I-)
Nitrogen monoxide (NO3-)

Question 19

Name some of the elements with a charge of -2

Answer 19

Sulfate (SO4-2)

Question 20

Name a elect with a charge of -3

Answer 20

phosphate (PO4-3)