An unknown solution contains either calcium ions orstrontium ions, but not both.

Question

An unknown solution contains either calcium ions orstrontium ions, but not both. Which one of these solutions couldyou use to tell whether the ions present are Ca2+ orSr2+? Explain the reasoning behind your choice. NaOH(aq) ,    H2SO4(aq) ,   H2S(aq) An unknown solution contains either calcium ions orstrontium ions, but not both. Which one of these solutions couldyou use to tell whether the ions present are Ca2+ orSr2+? Explain the reasoning behind your choice. NaOH(aq) ,    H2SO4(aq) ,   H2S(aq)

Explanation / Answer

Ca2+ , Sr2+ are fifth group cationshence its sulifides are soluble in water so H2S (aq) not useful forthe detection of cations given sulfates of Ca2+ , Sr2+ areinsoluble in water so H2SO4(aq) isuseful to determine the presence of either calciumor strontium Ca2+ (aq) + SO4-2(aq) ................>CaSO4 (s)   ; insoluble precipitate Sr2+ (aq) + SO4-2(aq) ................>SrSO4 (s)   ; insolubleprecipitate and hydroxides of Ca2+ , Sr2+ aresoluble in water so NaOH is not useful

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