Solubility products are determined experimentally by directly measuring either the concentration of one of the component ions or the solubility of the compound in a given amount of water. A color photograph of a kidney stone, 8 mm in length. Calculate its K sp. A We need to write the solubility product expression in terms of the concentrations of the component ions. Neither solid calcium oxalate monohydrate nor water appears in the solubility product expression because their concentrations are essentially constant.
We can use the mass of calcium oxalate monohydrate that dissolves in mL of water to calculate the number of moles that dissolve in mL of water. From this we can determine the number of moles that dissolve in 1. For dilute solutions, the density of the solution is nearly the same as that of water, so dissolving the salt in 1. Because each 1 mol of dissolved calcium oxalate monohydrate dissociates to produce 1 mol of calcium ions and 1 mol of oxalate ions, we can obtain the equilibrium concentrations that must be inserted into the solubility product expression.
The number of moles of calcium oxalate monohydrate that dissolve in mL of water is as follows:. The number of moles of calcium oxalate monohydrate that dissolve in 1. Inserting these values into the solubility product expression,. In our calculation, we have ignored the reaction of the weakly basic anion with water, which tends to make the actual solubility of many salts greater than the calculated value. The solubility of calcite in water is 0.
The reaction of weakly basic anions with H 2 O tends to make the actual solubility of many salts higher than predicted. A crystal of calcite CaCO 3 , illustrating the phenomenon of double refraction. When a transparent crystal of calcite is placed over a page, we see two images of the letters. Image used with permisison from Wikipedia. Calcite, a structural material for many organisms, is found in the teeth of sea urchins. The urchins create depressions in limestone that they can settle in by grinding the rock with their teeth.
Limestone, however, also consists of calcite, so how can the urchins grind the rock without also grinding their teeth? Researchers have discovered that the teeth are shaped like needles and plates and contain magnesium. The concentration of magnesium increases toward the tip, which contributes to the hardness. Moreover, each tooth is composed of two blocks of the polycrystalline calcite matrix that are interleaved near the tip. This creates a corrugated surface that presumably increases grinding efficiency.
Toolmakers are particularly interested in this approach to grinding. In this case, we treat the problem as a typical equilibrium problem and set up a table of initial concentrations, changes in concentration, and final concentrations ICE Tables , remembering that the concentration of the pure solid is essentially constant.
Calculate the aqueous solubility of Ca 3 PO 4 2 in terms of the following:. Our tutors rated the difficulty of What is the Ksp expression for CaF2? Our expert Chemistry tutor, Dasha took 2 minutes and 31 seconds to solve this problem. You can follow their steps in the video explanation above.
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Your Response. The Ksp of PbBr2 is 6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0. What is the molar solubility of PbBr2 in a 0. I tried solving using this the quadratic formula, but it didn't work. The Ksp value for barium sulfate is 1.
An insoluble salt with formula MX3 has a solubility product constant written in terms of.
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