Analysis of positively charged ions present in substance
A sample of river water is suspected to contain magnesium sulphate salt. Describe how the presence of Mg2+ ions can be established. (3 marks)
Suggested resposponses
- Add aqueous ammonia dropwise until in excess. (½
- Formation of white ppt which is insoluble dissolve in excess (½ shows presence of zinc ions. (½
- Add aqueous sodium hydroxide dropwise until in excess. (½
- A white ppt insoluble in excess (½ is formed confirms the presence of Mg2+ ions....
