Common ion effect

The first and second ionization constants of a weak dibasic acid $\ce{H2A}$ are $8.1\times10^{-8}$ and $1.0\times10^{-13}$ respectively. 0.1 mol of $\ce{H2A}$ was dissolved in 1 L of 0.1 M HCl solution. The concentration of $\ce{HA-}$ in the resultant solution is :

The solubility of barium iodate in an aqueous solution prepared by mixing 200 mL of 0.010 M barium nitrate with 100 mL of 0.10 M sodium iodate is $\boldsymbol{X}\times10^{-6}\ \mathrm{mol\,dm^{-3}}$. The value of $\boldsymbol{X}$ is _____.

Use: Solubility product constant ($K_{sp}$) of barium iodate $= 1.58\times10^{-9}$

Concentration of $\ce{H2SO4}$ and $\ce{Na2SO4}$ in a solution is 1 M and $1.8 \times 10^{-2}$ M, respectively. Molar solubility of $\ce{PbSO4}$ in the same solution is $X \times 10^{-Y}$ M (expressed in scientific notation). The value of $Y$ is ________.

[Given: Solubility product of $\ce{PbSO4}$ $(K_{sp}) = 1.6 \times 10^{-8}$. For $\ce{H2SO4}$, $K_{a1}$ is very large and $K_{a2} = 1.2 \times 10^{-2}$]

The solubility of AgCl will be maximum in which of the following ?

An acidified solution of 0.05 M $\ce{Zn^{2+}}$ is saturated with 0.1 M $\ce{H2S}$. What is the minimum molar concentration (M) of $\ce{H+}$ required to prevent the precipitation of ZnS?

Use $K_{sp}(\ce{ZnS}) = 1.25\times10^{-22}$ and overall dissociation constant of $\ce{H2S}$, $K_{\text{NET}} = K_1K_2 = 1\times10^{-21}$.

The solubility of a salt of weak acid (AB) at pH 3 is $\mathbf Y\times10^{-3}$ mol L⁻¹. The value of Y is ______.

(Given that the value of solubility product of AB ($K_{sp}$) = $2\times10^{-10}$ and the value of ionization constant of HB ($K_a$) = $1\times10^{-8}$)

The $K_{sp}$ of $\ce{Ag2CrO4}$ is $1.1\times10^{-12}$ at 298 K. The solubility (in mol/L) of $\ce{Ag2CrO4}$ in a 0.1 M $\ce{AgNO3}$ solution is

In 1 L saturated solution of AgCl [$K_{sp}$(AgCl) $=1.6\times10^{-10}$], 0.1 mol of CuCl [$K_{sp}$(CuCl) $=1.0\times10^{-6}$] is added. The resultant concentration of $\ce{Ag+}$ in the solution is $1.6\times10^{-x}$. The value of "$x$" is