Resolver los siguientes problemas relacionados con Soluciones Valoradas, pH, pOH y Titulacion. 1.- Si se disuelven 20 ml de alcohol en 80 ml de agua. Cual es el porcentaje de alcohol en la solucion? 2.-Que molaridad tiene una solucion de acido sulfurico, si 600 ml de la solucion contienen 50 gr del acido? 3.- Cuantos gramos de hidroxido de calcio se necesitan para preparar 750 ml de una solucion 0.15 Molar? 4.- Calcular el pH y el pOH de una solucion de HCl 4.9 × 10-4 M? 5.- Calcular el pOH y el PH de una solucion 0.00016M de KOH. 6.-Cual es el pH de una solucion 0.7 M de hidroxido de sodio? 7.- Que volumen de HBr 0.25 N sera necesario para neutralizar 50 ml de KOH 0.20 N? 8.- Cual es el volumen de acido clorhidrico 0.5 N que se requiere para neutralizar 20 ml de una solucion 0.3 N de NaOH? FORMULARIO: Va×Na=Vb×Nb pKw=pH+pOH pH=-log[H+] pOH=-log[OH-]

These questions are based on the attached photo. the experiment is about burning magnesium metal with oxygen. 1. write the balanced chemical equation for the reaction you are performing. 2. calculate the mass of magnesium metal used in each trial. o trial 1: o trial 2: 3. calculate the actual yield of magnesium oxide for each trial. o trial 1: o trial 2: 4. magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. o trial 1: o trial 2: 5. determine the percent yield of mgo for your experiment for each trial. o trial 1: o trial 2: 6. determine the average percent yield of mgo for the two trials. your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. if the average percent yield of this process is higher than that, this could save the company money. what is your recommendation to the company? support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

Which activity is an innate behavior