(a(i))[1]
State which negative ion has the smallest concentration.
(a(ii))[1]
Name the compound that contains Na$^+$ and NO$_3^-$ ions.
(a(iii))[1]
Calculate the mass of chloride ions present in $250\text{ cm}^3$ of lake water.
(b)[2]
Describe a test to detect sulfate ions. test .................... observations ....................
(c(i))[1]
Deduce the number of carboxylic acid groups in one molecule of citric acid.
(c(ii))[2]
Complete the table to calculate the relative molecular mass of citric acid.