Question

Find the qsp when 3.4 ml of 1 m hcl(aq) and 4.8 ml of 0.0022 m agno3(aq) are mixed together with enough water to dilute the solution to 40 ml. the solubility product of agcl is 1.6 × 10−10 .

Answer 1

moles of HCl = 1 * 0.0034 L = 0.0034 m
when the total volume = 0.04 L
[HCl] = 0.0034 / 0.04L = 0.085 M

then we need to get moles of AgNO3 = 0.0022 * 0.0048L = 0.00001 m
[AgNO3] = 0.00001 / 0.04 L = 0.00025 M

when Qsp = [Ag+][Cl-]
                 =0.00025 * 0.085 = 2.1x10^-5 
when Qsp > Ksp ∴ supersaturated salt will be precipitated untile Qsp becomes equal Ksp
So because of Qsp > Ksp 
∴ AgCl will be precipitated