13. (a) if h2s gas is led into a solution of 0.10m fecl2 , what is the highest ph value be controlled in the solution for just no fes precipitate forming?
(b) if h2s gas is led into a solution that is 0.10m each in fecl2 and cucl2 , will fes precipitate from the solution?
(the saturated solution of h2s in water is 0.10m at 25 degrees celsius, 1atm.)

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Which of these is a physical property