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Standardization of NaOH, why do you have to boil DI water? Why can’t NaOH be used as a primary standard?
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- 4. Two engineers are serving as trainees in a laboratory of a pharmaceutical company. One of their tasks involves determining the identity of a vitamin they were given by using any equipment or method at their disposal. As a hint, their supervisor gave them a list of possible candidates for the vitamins identity which includes: Vitamin Molecular Formula Folinic Acid C20 H23 N707 C3H11NO3 C,H,N20 C17H20N406 Pyridoxine Niacinamide Riboflavin To identify the vitamins identity, the two trainees separated their sample into two equal portions and performed two separate tests: [a.] Engr. Mayo used the flame atomic absorption spectrophotometer in order to identify the elemental composition of the sample which happens to be 59.0% C, 5.0% H and 22.9% N by mass [b.] Engr. Busog on the other hand mixed his 3.88 g sample with 30.0 mL of nitrobenzene, C,H5NO2 (Latent Heat of Fusion = 79.81 J/g). Using Beckmann's method, he determined the freezing point depression to be 7.1 deg C. Based on the tests…Br Br > WHat Kind oF (caalon is this? E2IEi|SNI|SN2 1, MgBr 2. H20 HO heat CH3 CH2C AIC132. Was there any physical change in the characteristics of trichloroethane when it was added to water?
- 2 What is reservior in environmental chemistry? What are O1D (O singlet D) and O3P( O priplet P)? Not sure if it's written in this way.pour it 2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation foea added that spoiled milk coagulates.A B |· | D E NaOH H₂O NH3 KF CH3NH2
- Chemistry In a TLC experiment, three spots were made. In spot A was a crude sample of a mixture of three compounds ethyl 4- aminobenzoate (base), salicylic acid, and naphthalene as the neutral compound. In spot B, was just the neutral compound, naphthalene. In spot C was the pure compounds of spot A. When dipped with KMnO4, it is said that all spots should turn yellow, but while doing the experiment it was only the bottom compounds that turned yellow for me which I found out was the acid. Should all spots really turn yellow? Why would this happen?CI CH3 CH2OH, CHICH ONa Д H, Br 2. Nacn 2. NaOH, H20, 3.НЗ ОТ ? 72AB. Please don't write on a paper. I can't understand handwritten.