Cool to room temperature, and continue titration until yellow color is reached. Note down the volume seen on the burette 4) Heat the substance again until all the liquid is gone ND you’re left with salt looking particles inside the beaker S) Weigh the beaker with the salt inside of Then, clean out the beaker thoroughly and weigh the empty beaker again. Use these two weights to find the mass in grams of the salt like particles that were previously in the beaker. Standardization of Unknown 2 I) Weigh duplicate O.
IS g samples Of unknown I _ Dissolve samples in 100- ml blue. Titrate it With HCI until green color is reached. 3) Heat and boil out CA gently. You should obtain a blue color again at the end of this step. Cool to room volume seen on the burette. 4) Heat the substance again until all the liquid is gone ND you’re left with salt looking particles inside the beaker S) Weigh the beaker with the salt inside of it. Then, clean out the beaker thoroughly and weigh the like particles that were previously in the beaker.
Now to identity which substance is Enhance and Which is Niacin pay close attention the mass recorded for the salt like particles that were left in the beaker. The one that is closest to . 1043 g is the Enhance and the one closest to . 165 g is the Niacin. Results Grams recorded for Unknown 1-. 07 g unknown 1=Enhance Percent yield= 67% Grams recorded for unknown 2-. 14 g unknown Niacin Percent yield: 85% Discussion When trying to identify which unknown substance was Enhance and which was Niacin. We had to make sure to titrate and treat each unknown with the same amount of attention.
By over titrating one of the unknowns we could have messed up the experiment and would have had to start over, When heating the liquid on the hot plate, we were making all the CA in the liquid evaporate leaving us with just the salt like particles that we were looking for, By weighing the salt we were able to justify what the substance was because to previous conversions that we had worked out. Conclusion The purpose of this experiment was to show how titrating a substance can help to identify that substance.
Knowing how to work with geochemistry equations is also a big part of this lab because we used those equations to help us compare and figure out the identity of the substance. After titrating and evaporating the CA, the weight of unknown 1 was . 07 g which was closest to the theoretical Yield of . 1043 g. Unknown I Vass identified as Enhance. After titrating and evaporating the CA, the weight of unknown 2 avgas . 14 g which was closest to the theoretical yield Of . 165 g. Unknown 2 was identified as Niacin.