Can anyone tell me if Silver Bromide is soluble or insoluble. If so, could you explain it to me?
Silver bromide (AgBr), a soft, pale-yellow, INSOLUBLE salt well known (along with other silver halides) for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in black-and-white photography film and is believed by some to have been used for faking the Shroud of Turin. Due to these photosensitive properties silver bromide is considered also an ionic semiconductor. The salt can be found naturally as the mineral bromargyrite (bromyrite). The silver halides have a wide range of solubilities, noting that the solubility of AgF is about 6 x 107 times greater than that of AgI. These differences are attributed to the relative solvation enthalpies of the halide ions; the enthalpy of solvation of fluoride is anomalously large. AgBr solubility is 0.000014 Ksp (g / 100 g H2O) .
Why is CaSO4 (calcium sulphate) not soluble in hot water but soluble in cold water?
The phenomenon can be explained by understanding that certain compounds like CaSO4, when dissolved in water, are exothermic in nature. This means that the heat evolved during the dissolving process is greater than the heat required to break the solid bonds apart. In such a scenario, if we increase the temperature, equilibrium will move towards that direction which favors a decrease in temperature or let's say one that makes the system more endothermic. This is achieved by less dissolving of the compound, so the heat evolved is less. Thus on increasing the temperature, solubility descreases and so the solubility is much larger in cold water than hot water. This is relatively a rare phenomenon. It is also observed in sodium sulphate. If the explanation is difficult to understand here is another way to understand it. Found this on a particular site. Consider an exothermic reaction (heat is essentially on the product side with the dissociated ions) . Increase in temperature results in a stress on the product side from the additional heat. Le chateliers principle states that the system shifts towards the reactant side to alleviate the stress. By shifting towards the reactant side, less of the solid is dissociated, leading to decreased solubilty with temperature.
Why is Fe+3 insoluble and Fe+2 soluble?
Both are soluble in water. It’s a matter of the degree of solubility based on the acidity of the ion. I lifted the rule from a web page with no proper author attribution but this is as I remember it: “The rule is z^2/r, where z is the charge and r is the radius of the atom. We use this ratio to determine acidity. You can look up this information online if you are interested and you will find the one with the larger ratio is the most acidic. If it is more acidic, it will dissolve more (least acidic will remain relatively unchanged as a hydrated ion).” You might want to browse through this reference. Fe2+ compared to Fe3+ solubility
What is the relationship between solubility and pH?
pH = -log(a_H+) where a_H+ is the proton activity (the relationship could also be expressed using H3O(+) instead of H(+))activity is an expression of effective concentration (c.f. Thermodynamic activity - Wikipedia). So pH is related to acid or base concentration. The particular solute which is being used to change pH can either lower or increase solubility of another salt and the effect may change depending on acid or base concentration. So the short answer is that the effect of pH on another salt’s solubility is not necessarily simple.The case above is fairly simple: increasing HCl concentration (decreasing pH) lowers the solubility of NaCl (aka halite)Likewise increasing the pH (higher NaOH concentration) has a similarly simple effect on halite solubility.Conversely, gypsum solubility in sulfuric acid is more complex
Why does ethanol dissolve sugar but not salt?
That is quite a complex question. I understand your question even though Salt actually does dissolve in ethanol although not as much.I will try to answer without going on about it :)The solubility of substances depends in this case on charge or polarity between a “solvent and a solute” This polarity attracts + to - and conversely - to +.A lot of organic solvents are called non polar and do not dissolve ionic solutes. Water is a polar solvent and as you know a lot of stuff dissolves in it. Alcohols are less so and solvents with no charge are non polar and will only dissolve some other non polar solutes for different reasons though.NaCl is made up of Na+ ions and Cl- ions bound by their charge attraction. Water molecules have a polar arrangement —one side (hydrogen) has a positive charge and the other side (oxygen) has a negative charge. When you put NaCl in water the ions are attracted to the water molecules, separate and cease being solid and float around with the H2O molecules in the solution. This is also why you can not see it anymore.When you put salt in Ethanol some will disappear but the majority will sit on the bottom of the container. Some does dissolve because ethanol has a negative charge from the oxygen atom and can attract a few of the salt ions.All this being said, both salt and sugar dissolve much better in water than in alcoholThis only scratches the surface of solubility and checking my fact lead me toWhat is Solubility? Definition of Solubility, solute, solvent and solution in Solubility of Things.This a great site that explains everything about solubilityCheers,Dwarven
What are some examples of soluble and insoluble substances in water?
Following are some of the examples of insoluble and soluble materials in water.Examples of insoluble materialsSand is an example of insoluble materialFlour is an example of insoluble materialStones are examples of insoluble materialsGravel is an example of insoluble materialExamples of soluble materialsSoap is an example of soluble materialSalt is an example of soluble materialSugar is an example of soluble material