A 110.0 −mL sample of a solution that is 2.6×10−3M in AgNO3 is mixed with a 230.0 −mL sample of a solution that is 0.14 M in NaCN

After the solution reaches equilibrium, what concentration of Ag+(aq) remains? The Kf value of Ag(CN)2− is 1×1021.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.