The minimum mass of NaBr which should be added in 200 ml of 0.0004 M-AgNO3 solution just to star

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The minimum mass of NaBr which should be added in 200 ml of...

The minimum mass of NaBr which should be added in $200 \mathrm{ml}$ of $0.0004 \mathrm{M}-\mathrm{AgNO}_{3}$ solution just to start the precipitation of AgBr. $K_{\mathrm{sp}}$ of $\mathrm{AgBr}=4 \times 10^{-13} \cdot(\mathrm{Br}=80)$ (a) $1.0 \times 10^{-9} \mathrm{~g}$ (b) $2 \times 10^{-10} \mathrm{~g}$ (c) $2.06 \times 10^{-8} \mathrm{~g}$ (d) $1.03 \times 10^{-7} \mathrm{~g}$

The minimum mass of NaBr which should be added in $200 \mathrm{ml}$ of $0.0004 \mathrm{M}-\mathrm{AgNO}_{3}$
solution just to start the precipitation of AgBr. $K_{\mathrm{sp}}$ of $\mathrm{AgBr}=4 \times 10^{-13} \cdot(\mathrm{Br}=80)$
(a) $1.0 \times 10^{-9} \mathrm{~g}$
(b) $2 \times 10^{-10} \mathrm{~g}$
(c) $2.06 \times 10^{-8} \mathrm{~g}$
(d) $1.03 \times 10^{-7} \mathrm{~g}$

Key Concepts

Ksp (Solubility Product Constant)

The Ksp, or solubility product constant, is an equilibrium constant that applies to the dissolution of a sparingly soluble ionic compound. It is the product of the molar concentrations of the constituent ions raised to the power of their stoichiometric coefficients in the dissolution equation. In the context of precipitation, Ksp determines the maximum ionic product that can exist in solution before a solid precipitate begins to form.

Precipitation Equilibrium

Precipitation equilibrium is reached when the product of the ion concentrations in solution equals the Ksp of the compound. This concept helps predict when a dissolved salt will start to precipitate out. If the ionic product exceeds the Ksp, the solution becomes supersaturated and precipitation occurs to restore equilibrium.

Reaction Stoichiometry

Reaction stoichiometry involves using the balanced chemical reaction to relate the moles of reactants and products. In precipitation reactions, it allows for the calculation of the exact amount of a reactant (ion) needed to reach the point where the ionic product equals the Ksp, triggering precipitation.

Molar Mass and Mass Calculation

Molar mass is the mass of one mole of a substance, a fundamental concept for converting between moles and grams. This conversion is essential when determining the minimum mass of a compound required to supply a precise number of moles of an ion needed for initiating precipitation at the solubility limit.

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