A solution contains 0.1 M Sr2+ ions and 0.1 M Ag+ ions. Addition of an equal volume of a 0.5 M solut — Aqueous Chemistry Chemistry Question

A solution contains 0.1 M Sr²⁺ ions and 0.1 M Ag⁺ ions. Addition of an equal volume of a 0.5 M solution of which reagent will cause precipitation of a strontium salt but not a silver salt?