Skip to content
MathsGenie logo
Open app

Course home

  1. GCSE
  3. Chemistry Edexcel
  5. Question bank

Methods of separating and purifying substances

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455
Question 26

Table 1 shows the results of a chemical analysis on a sample of bottled mineral water used for drinking.

Table 1: Concentration of dissolved ions in the mineral water sample

Dissolved ionConcentration in mg dm−3\text{mg dm}^{-3}mg dm−3
Sodium (Na+{\text{Na}}^+Na+)14.50
Calcium (Ca2+{\text{Ca}}^{2+}Ca2+)38.20
Potassium (K+{\text{K}}^+K+)1.80
Chloride (Cl−{\text{Cl}}^-Cl−)21.30
Hydrogencarbonate (HCO3−{\text{HCO}}_3^-HCO3−​)145.00
Sulfate (SO42−{{\text{SO}}_4}^{2-}SO4​2−)12.10

Using information from Table 1, explain why this bottled mineral water is not chemically pure water.

[2]

Methods of separating and purifying substances Questions

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