(a(i))[1]
Name the negative ion with the greatest concentration.
(a(ii))[1]
State the formula for the ammonium ion.
(a(iii))[2]
Describe a test to identify the presence of chloride ions, Cl-, in a sample of water. Include the test and observations.
(a(iv))[1]
Calculate the mass of hydrogencarbonate ions, HCO3-, in $200\text{ cm}^3$ of the contaminated water.
(b)[1]
Name a process that would make the water suitable for practical chemistry.
(c(i))[1]
State the reason carbon is used in water treatment.
(c(ii))[1]
State the reason water is chlorinated.
(d(i))[1]
Name the separation method illustrated in Fig. 3.1.
(d(ii))[1]
Label the solvent front on Fig. 3.1.