Question

Задача на растворимость. Помогите. Образуется ли осадок, если смешать равные объёмы гипсовой воды CaSO4 и 0,02 М раствора K3PO4?

Answer 1

Ответ:

При сливании равных объемов солей, концентрации каждой соли упадет вдвое и образуется йнов согласно уравнений диссоциаций.

CaSO4 <=> Ca[2+] + SO4[2-]

C(Ca2+)=0.01 моль/литр

K3PO4 <=> 3K[+] + PO4[3-]

C(PO4-)=0.01 моль/литр

Произведение концентрации йонов для фосфата кальция

ПK = C(Ca2+)^3*C(PO4-)^2

ПК=0,01^3*0.01^2=10^-10

Произведение растворимости по справочнику для фосфата кальция

ПР=10^-25

Произведение концентрации йонов больше произведения растворимости - осадок выпадет.

Answer 2

Task on Solubility: Will a Precipitate Form if Equal Volumes of Calcium Sulfate (CaSO4) and 0.02 M Potassium Phosphate (K3PO4) Solution are Mixed?

To determine if a precipitate will form when equal volumes of calcium sulfate (CaSO4) and 0.02 M potassium phosphate (K3PO4) solution are mixed, we need to consider the solubility rules for these compounds.

Calcium sulfate (CaSO4) is generally considered insoluble in water, meaning it does not readily dissolve. On the other hand, potassium phosphate (K3PO4) is soluble in water.

According to the solubility rules, when a soluble compound (potassium phosphate) is mixed with an insoluble compound (calcium sulfate), a precipitate may form if the product of the concentrations of the ions in the resulting solution exceeds the solubility product constant (Ksp) for the insoluble compound.

To determine if a precipitate will form, we need to compare the concentrations of the ions in the resulting solution with the Ksp value for calcium sulfate.

Unfortunately, the specific Ksp value for calcium sulfate is not provided in the search results. However, we can make an assumption based on the general solubility rules. Calcium sulfate has a relatively low solubility, so it is likely that a precipitate will form when equal volumes of calcium sulfate and potassium phosphate solution are mixed.

Please note that this is a general assumption based on the solubility rules, and the actual outcome may depend on various factors such as temperature, pH, and specific concentrations of the solutions.

In summary, when equal volumes of calcium sulfate (CaSO4) and 0.02 M potassium phosphate (K3PO4) solution are mixed, it is likely that a precipitate will form due to the relatively low solubility of calcium sulfate. However, without the specific Ksp value for calcium sulfate, we cannot provide a definitive answer.

Note: The specific Ksp value for calcium sulfate and further experimental data would be required to provide a more accurate answer.