Advertisements
Advertisements
Question
What is the effect of temperature on solubility of solids in water? Give examples.
Advertisements
Solution
1. The effect of temperature on solubility of a substance depends on enthalpy of solution.
a. When the substance dissolves in water by an endothermic process, that is, with the absorption of heat, its solubility increases with an increase of temperature.
e.g. KCl dissolve in water by endothermic process.
b. On the other hand, when the substance dissolves in water by an exothermic process, that is, with the release of heat, its solubility decreases with an increase of temperature.
e.g. CaCl2 and Li2SO4.H2O dissolve in water releasing heat.
2. It is important to understand that there is no direct correlation between solubility and exothermicity or endothermicity. For example, dissolution of CaCl2 in water is exothermic and that of NH4NO3 is endothermic. However, the solubility of these substances increases with the temperature
APPEARS IN
RELATED QUESTIONS
Sugar dissolves in water because ______.
The solubility of a gas in water ______.
The units of Henry’s law constant are ______.
The solubility of the following salts in water increases with increase in temperature, EXCEPT:
Which of the following is INCORRECT?
Henry's law constant for a gas CH3Br is 0.159 mol dm−3 atm−1 at 25°C the solubility of CH3Br in water at 25°C and a partial pressure of 0.164 atm ____________.
The Henry's law constant for oxygen is 1.3 × 10-3 mol dm-3 atm-1. If partial pressure of oxygen is 0.46 atmosphere, what is the concentration of dissolved oxygen at 25°C and 1 atm pressure?
0.5 molal aqueous solution of a weak acid (HX) is 20% Ionized. If Kr of water is 1.86 K kg mol-1, the lowering in freezing point of solution is ______.
Solubility of a gas in liquid increases with ______.
Which of the following is strongest nucleophile?
Partial pressure of a solution component is directly proportional to its mole fraction. This is known as ______.
Henry's law constant for CH3Br(g) is 0.159 mol dm–3 bar–1 at 25°C. What is the solubility of CH3Br(g) in water at the same temperature and partial pressure of 0.164 bar?
What is Henry's law?
According to the Le-Chatelier principle, adding heat to a solid \[\ce{<=>}\] liquid equilibrium will cause the ______.
The solubility (in mol L−1) of AgCl (Ksp = 1.0 × 10−10) in a 0.1 M KCl solution will be ______.
How does entropy change in the following process? Explain.
Dissolving sugar in water
Explain the solubility of gases in liquids.
The solubility of N2 gas in water at 25° C and 1 bar is 6.85 × 10−4 mol L−1. Calculate KH (Henry’s law constant).
Depending on the states of solute and solvent there are ______ types of solutions.
Henry’s constant for CH3Br(g) is 0.159 mol dm−3 bar−1 25°C. Calculate its solubility in water at 25°C, if its partial pressure is 0.164 bar.
Calculate the concentration of dissolved gas in water at 25°C if partial pressure of gas at same temperature is 0.15 atm. [KH = 0.15 mol dm-3 atm-1]
Calculate the Henry’s law constant at 25°C if the solubility of gas in liquid is 2.1 × 10−2 mol dm−3 at 0.18 bar.
