Choose the right answer In the Enthalpy, Entropy and Free Energy experiment, whi

Question

Choose the right answer
In the Enthalpy, Entropy and Free Energy experiment, which one of the following would cause the calculated value of the solubility product constant, K_sp to be too small? Allowing the collected sample to cool prior to beginning the titration. Collecting solid lead chloride from the aqueous solution in addition to the aqueous sample that is then titrated. Titrating until you see red precipitate form. Using a cool pipet, which causes lead chloride to precipitate and not be delivered into the sample to be titrated.

Explanation / Answer

Answer:

Solubility product Ksp mathematically is product of concentration of ions formed after ionization.

Lower the ionic concentration of ionic species smaller is the product of ionic concentration and hence smaller is the Ksp value.

On collecting solid PbCl2 (Lead chloride) from aqueous solution will lower the would be concentration of ionic species ([Pb2+] and [Cl-] ) and hence smaler will be the Ksp value.

Answer option (b) : Collecting solid Lead chloride from the aqueous solution in addition to the aqueous samle that is then to be titrated

--- will cause Ksp value too small to say precise or accurate or reliable.

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