Chemistry and Biochemistry Academy

A sucrose solution containing 30gram sucrose (C 12 H 22 O 11 ) in 300ml of that solution, the density of the solution is 2.04g/mm. when these are provided: C=12, H=1, O=16, calculate: (i)                  Molality of sucrose solution   (ii)                Molarity of   sucrose solution (iii)              Weight of sucrose solution (iv)              Mole fraction of sucrose solution  To answer question (i) and (ii) we should know what is molality and molarity to avoid confusion that may arise. Molality is a measure of the concentration of a solute in a solution in terms of amount of substance in specified amount of mass of the solvent. It is also known as molal concentration. Its common unit in chemistry is mol/kg while molarity which also known as molar concentration is a measure of the concentration of a solute in a solution or any chemical species in terms of amount of substance in a given volume. Its unit in chemistry is mol/L. Calculations (i)       

A solution of sucrose in water contains 14% of sucrose by weight. 150kg of the solution is evaporated to remove some amount of water; the remaining solution is cooled to 18˚C. If the yield of sucrose is 90%, calculate the amount of water evaporated. Given that; molecular formula of sucrose (C 12 H 22 O 11 ), C=12, H=1, O=16 and solubility of sucrose is 0.40kg/mole.  This is a mass balance of crystallized substance question in most industries, for instance sugar processing industry. To this question you have to come up with two equations: one for general material balance and the other is for crystallized substance (in decimal points or in solid fraction). If you have been in sugar processing industry you have realized that cane juice coming to the evaporators, to pans then massecuites to the crystallizers and final to the centrifugal machines where the molasses is separated from sugar (sucrose). This question is derived from that process. Let material charged in the pro

When Obama came to Kenya July this year he said; "When it comes to the people of Kenya, especially the youth, I believe there is no limit to what you can achieve, y ou can build your future right here, right now." Th ese are the steps some of young Kenyans have taken to create their future right here in Kenya. In 2014 I met Steve Ogolla Osumba in one of the Kenya Competition for colleges and university students at Lions of Science. My project made it to the shortlis ting stage but I did not make it to the final stage while Steve project made it final stage but did not make it to the top three finalists. From that stage Steve have not been silent on working on his project and other projects and due to this he submitted another project to Lions Science for the second and fortunately he made it to the top three winners.   Steve 's project is on (innovation/invention, Agriculture and Energy). Before we know the future, it is very important to know our past.