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Methods of separating and purifying substances

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Question 50

Table 1 shows the results of an analytical assay on a sample of high-pressure boiler feed-water collected at a power generation facility.

Table 1: Concentration of trace impurities in the boiler feed-water sample

Dissolved speciesConcentration in mg dm−3\text{mg dm}^{-3}mg dm−3
Magnesium (Mg2+{\text{Mg}}^{2+}Mg2+)0.45
Silica (SiO2{\text{SiO}}_2SiO2​)0.12
Sodium (Na+{\text{Na}}^+Na+)0.08
Chloride (Cl−{\text{Cl}}^-Cl−)0.15
Sulfate (SO42−{{\text{SO}}_4}^{2-}SO4​2−)0.05

Using the data provided in Table 1, explain why this boiler feed-water sample cannot be classified as chemically pure water.

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Methods of separating and purifying substances Questions

  1. GCSE
  2. /Chemistry
  3. /Methods of separating and purifying substances