Percent Yield Lab
Gladys Mesta
Dr. Mbah
December 6, 2012
Percent Yield of a Chemical Reaction
Introduction
Yield is the quantity of product in a chemical reaction, the theoretical yield of a reaction can be calculated using mole ratios from the balanced chemical reaction. The actual yield has to be obtained and measured in a laboratory. It may be usual to often find the actual yield to be less than the theoretical yield due to many different factors. This gives rise to the concept of percent yield. Sodium bicarbonate and hydrochloric acid was used in the experiment. The yields of sodium chloride reaction were determined and then compare it to the theoretical yield.
HCl(aq) + NaHCO3(s) -> NaCl(aq) + CO2(g) + H2O(I)
Materials and Methods
In order to determine the percent yield of a reaction they will have to perform a series of instructions leading the students to the completion of the experiment. Weighted a clean dry 250-ml beaker, then add 2.5g of baking soda to the beaker this will be color white in form of powder, after the solution was added they accurately weighted …show more content…
There are many sources of error in this experiment it is possible for the percent yield to be greater than 100 % this occurs when reactions are not allowed to finish meaning that some of the previous unwanted remains with the desired product. It could still contain small amounts of water. Students have to be very specific with the weight recordings and heating in order to get accurate results. The reasons it may be lower than 100 % could be side reactions or human error in weighing it. Also it is a slow reaction you may have not allowed the full reaction to occur before weighing it. Usually the percent yield is less than a 100 % because some of the desired product is either lost in the physical separation of a chemical
Dr. Mbah
December 6, 2012
Percent Yield of a Chemical Reaction
Introduction
Yield is the quantity of product in a chemical reaction, the theoretical yield of a reaction can be calculated using mole ratios from the balanced chemical reaction. The actual yield has to be obtained and measured in a laboratory. It may be usual to often find the actual yield to be less than the theoretical yield due to many different factors. This gives rise to the concept of percent yield. Sodium bicarbonate and hydrochloric acid was used in the experiment. The yields of sodium chloride reaction were determined and then compare it to the theoretical yield.
HCl(aq) + NaHCO3(s) -> NaCl(aq) + CO2(g) + H2O(I)
Materials and Methods
In order to determine the percent yield of a reaction they will have to perform a series of instructions leading the students to the completion of the experiment. Weighted a clean dry 250-ml beaker, then add 2.5g of baking soda to the beaker this will be color white in form of powder, after the solution was added they accurately weighted …show more content…
There are many sources of error in this experiment it is possible for the percent yield to be greater than 100 % this occurs when reactions are not allowed to finish meaning that some of the previous unwanted remains with the desired product. It could still contain small amounts of water. Students have to be very specific with the weight recordings and heating in order to get accurate results. The reasons it may be lower than 100 % could be side reactions or human error in weighing it. Also it is a slow reaction you may have not allowed the full reaction to occur before weighing it. Usually the percent yield is less than a 100 % because some of the desired product is either lost in the physical separation of a chemical