Thallium sulfide (Tl2S) less soluble compound;
a) Calculate the solubility of 3x10^-2 M TlNO3 (ignoring the basicity of sulfur and taking into account the ionic strength).
b) Calculate the solubility of this compound (without considering the ionic strength) at pH = 2.0 pK (Tl2S) = 20.0 ; For H2S: pK1 = 7.0; pK2 = 13.0