Ions And PH

Question 1

Iron

Answer 1

Fe 2+
Haemoglobin
Chlorophyll

Question 2

Phosphate

Answer 2

PO4 2-
Fertiliser
ATP
Bones
DNA
Phospholipids

Question 3

Hydrogen

Answer 3

H+
DNA
Respiration
Photosynthesis
Translocation

Question 4

Sodium

Answer 4

Na +
Nerve impulses
Muscle contraction
Kidney function

Question 5

Nitrate

Answer 5

NO3 -

Plant fertiliser

Question 6

Acid and alkali formation from water

Answer 6

Dissociate into OH- and H+
H+ join with water molecule, form hydronium ion (hydrogen ions)
Equal proportion of H+ and OH- ions

Question 7

Acids

Answer 7

Donates hydrogen ions

Acidic solution when more H+ ions than OH-

Question 8

Bases

Answer 8

Accepts H+

Alkali when more OH- than H+

Question 9

pH scale

Answer 9

Logarithmic scale

I unit change=10 fold change in hydrogen ion concentration

Question 10

How to calculate pH from H+

Answer 10

pH=-log[H+]

Make it positive

Question 11

How to calculate H+ from pH

Answer 11

[H+]=10^-pH
Make the given pH negative
Round to sensible no of significant figures