How do you find the solubility product of calcium hydroxide?
How do you find the solubility product of calcium hydroxide?
1 Answer
- Ca(OH)₂(s) ⇌ Ca²⁺(aq) + 2OH⁻(aq) I/mol·L⁻¹: -; 0; 0. C/mol·L⁻¹: -; + x ; + 2x. E/mol·L⁻¹: -; x ; 2x.
- Ksp = [Ca²⁺][ OH⁻]² = x×(2x)2=4×3 = 5.5 × 10⁻⁶
- x3 = 1.375 × 10⁻⁶ (2 significant figures + 2 guard digits)
- x = ∛(1.375 ×10⁻⁶) = 1.1 × 10⁻²
- Solubility = x mol/L = 1.1 × 10⁻² mol/L = 0.011 mol/L.
What is the solubility product of calcium hydroxide?
Calcium hydroxide
| Names | |
|---|---|
| Solubility in water | 1.89 g/L (0 °C) 1.73 g/L (20 °C) 0.66 g/L (100 °C) (retrograde solubility, i.e., unusually decreasing with T) |
| Solubility product (Ksp) | 5.02×10−6 |
| Solubility | Soluble in glycerol and acids. Insoluble in alcohol. |
| Basicity (pKb) | 1.37 (first OH−), 2.43 (second OH−) |
What is the KSP value for calcium hydroxide?
6.5 × 10–6
8 The approximate value of the Ksp for calcium hydroxide is 6.5 × 10–6, so calculate a rough value of the concentration of OH– ion, [OH–], in the saturated solution (see prelab question on WebAssign; to two significant figures).
How would you prepare a saturated solution of calcium hydroxide?
Create a saturated solution of calcium hydroxide by adding 0.10-0.30g of Ca(OH)2 to 30 mL of distilled water in a 50 mL beaker. You should see some undissolved calcium hydroxide at the bottom of the beaker. If not, add a little more calcium hydroxide.
What is the pH of calcium hydroxide?
pH 12.8
Estrela and Figueiredo13 state that calcium hydroxide is a white alkaline (pH 12.8) powder with poor solubility in water (solubility of 1.2 g.L–1 of water at 25 °C). It is a strong base obtained by calcining calcium carbonate until it transforms into calcium oxide (quicklime).
What does a saturated solution of calcium hydroxide mean?
A saturated solution of calcium hydroxide has the solid in equilibrium with its ions as shown below: Ca(OH)2(s) ↔ Ca2+(aq) + 2OH-(aq) Recall that a saturated solution is a solution that contains the maximum amount of dissolved solute possible at a given temperature.
Why do you need to use a saturated calcium hydroxide solution to determine the KSP of calcium hydroxide?
It is very important for the accuracy of this test to have a saturated aqueous solution of calcium hydroxide and the Ksp of this substance allows us to determine exactly how much calcium hydroxide to dissolve until the saturation point is reached.
What is the calcium formula?
Calcium ion | Ca+2 – PubChem.
How do you calculate solubility?
Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a given temperature. Such a solution is called saturated. Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g .
What is the formula for calcium hydroxide solution?
Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder and is obtained when calcium oxide (called lime or quicklime) is mixed, or slaked with water.
Is calcium hydroxide insoluble in water?
Calcium hydroxide is relatively insoluble in water, with a solubility product Ksp of 5.5 × 10−6. It is large enough that its solutions are basic according to the following reaction: At ambient temperature. Calcium hydroxide (portlandite) dissolves in pure water to produce an alkaline solution with a pH of about 12.4.