you are given two unlabelled colorless solutions: AgNO3(aq) and Ca(NO3)2.
A)Which ion when added to each unlabelled solution would produce a precipitate with the calcium and silver ions?
No clue what this question is asking. Can I get help?
2 answers
Would it be SO4 2-
Yes. This is a standard question in qualitative analysis but it's a little confusing; i.e., I don't know if the idea is to identify the solutions, add an ion which will form a ppt in BOTH, or just what. You need to know the solubility rules.
Chloride ion (say NaCl) added to AgNO3 will give a white ppt of AgCl but added to Ca(NO3)2 gives no ppt. Therefore, add NaCl to a portion of each and you identify the AgNO3 solution immediately.
If the idea is to add an ion which will form a ppt in BOTH, then phosphate ion (PO4^3-) as in Na3PO4 will form Ag3PO4 and Ca3(PO4)2. The Ag salt is yellow colored and the Ca salt is white.
Chloride ion (say NaCl) added to AgNO3 will give a white ppt of AgCl but added to Ca(NO3)2 gives no ppt. Therefore, add NaCl to a portion of each and you identify the AgNO3 solution immediately.
If the idea is to add an ion which will form a ppt in BOTH, then phosphate ion (PO4^3-) as in Na3PO4 will form Ag3PO4 and Ca3(PO4)2. The Ag salt is yellow colored and the Ca salt is white.
1 answer