SUPPOSE .1g OF A AND 1.0ml WATER WERE MIXED AND HEATED TO 80 DEGREE CELCEOUS.WOULD ALL THE SOLID DISOLVED.AND IF THE SOLUTION IS COOLED AT WHAT TEMPARATURE CRYSTALS WILL APPEAR.
You should learn to spell celsius. Please don't use all caps. We have difficulty ready all caps. You don't have enough information to answer the question. You must have solubility data in the problem. Why not post that, too?
To determine if all of the solid will dissolve, we need to know the solubility of substance A in water at 80 degrees Celsius. If the solubility is lower than 0.1g in 1.0ml of water at that temperature, then not all of the solid will dissolve.
To find the solubility, you can refer to a solubility table or conduct experiments. Once you have determined the solubility, you can compare it with the amount of substance A (0.1g) to determine if it will all dissolve.
Regarding the formation of crystals, if the solution is saturated (containing the maximum amount of dissolved solute) and then cooled, crystals will start to appear. The temperature at which crystals will begin to form is known as the saturation temperature for that particular compound.
The saturation temperature can vary depending on the compound. To determine the saturation temperature, you can cool the solution slowly while observing the formation of crystals. The temperature at which the first crystals become visible is the saturation temperature for the given solution.