149k views
3 votes
A solution contains 1.77g of dissolved silver. What mass of potassium chloride must be added to completely precipitate all of the silver?

User Mable John
by
7.6k points

1 Answer

5 votes
Ag++Clâ’→AgCl(s)âŹâ†“ We need to add over 1 g KCl. Moles of silver in solution = 1.77â‹…g107.87â‹…gâ‹…molâ’1` = 0.0164â‹…mol Clearly we need an equivalent quantity of chloride, thus we add a mass of potassium chloride = 0.0164â‹…molĂ—74.55â‹…gâ‹…molâ’1 = ??â‹…g The 1 equiv will precipitate most of the silver ion. Silver chloride will possess some aqueous solubility. The result is a curdy white precipitate of silver chloride.
User Dilshad Abduwali
by
8.4k points