Problem: Suppose you have a solution that might contain any or all of the following cations: Ni2+, Ag+, Sr2+, and Mn2+. Addition of HCl solution causes a precipitate to form. After filtering off the precipitate, H2SO4 solution is added to the resultant solution and another precipitate forms. This is filtered off, and a solution of NaOH is added to the resulting solution. No precipitate is observed.Which of the four cations listed above must be absent from the original solution?

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We are asked which of the four cations listed above must be absent from the original solution

Ni2+, Ag+, Sr2+, and Mn2+


Ni2+ and Mn2+

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Problem Details

Suppose you have a solution that might contain any or all of the following cations: Ni2+, Ag+, Sr2+, and Mn2+. Addition of HCl solution causes a precipitate to form. After filtering off the precipitate, H2SO4 solution is added to the resultant solution and another precipitate forms. This is filtered off, and a solution of NaOH is added to the resulting solution. No precipitate is observed.

Which of the four cations listed above must be absent from the original solution?

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