(a(i))[1]
Name the positive ion present at the greatest concentration.
(a(ii))[1]
State the formula of the sulfate ion.
(a(iii))[2]
Describe a test, and the observations, to identify the presence of iodide ions, I-, in a sample of water.
(a(iv))[1]
Calculate the mass of nitrate ions, NO3-, in 200 cm3 of river water.
(b)[1]
Give the formulae of two ions from Table 3.1 that may be combined with potassium ions to make an NPK fertiliser.
(c)[2]
Name two ions from Table 3.1 that cause deoxygenation of water and harm aquatic life.
(d)[1]
Name the separation method shown in Fig. 3.1.