The color of the solid crude product after grinding with NaOH is dark brown.
The first step in calculating the yield and mass for the formation of the product 2-(3,4-dimethoxybenzylidene)indan-1-one is to determine the moles of each of the reactants.
Multiplying the amount of 3,4-dimethoxybenzaldehyde used in the experiment (0.25 g) with its molecular weight (166.17 g/mole) we end up with 0.0015 moles 3,4-dimethoxybenzaldehyde.
Doing the same for 0.20 g of 1-indanone, molecular weight 132.16 g/mole also results in 0.0015 moles of 1-indanone.
According to the chemical equation it takes 1 molecule of 3,4-dimethoxybenzaldehyde and 1 molecule of 1-indone to form 1 molecule of the product 2-(3,4-dimethoxybenzylidene)indan-1-one. Both reagents have the same number of moles therefore either one can be considered as the limiting reagent.
The theoretical mass of the crude product is calculated by multiplying the moles of the limiting reactant with the molecular weight of the final product, 2-(3,4-dimethoxybenzylidene)indan-1-one.
The percent yield of the crude product will be the actual amount obtained over the theoretical mass multiplied by 100. If 0.40 g of 2-(3,4-dimethoxybenzylidene)indan-1-one is obtained after vacuum filtration, then the percent yield would be:
Hence, the percent of theoretical yield of the crude product is.
Chegg is one of the leading providers of homework help for college and high school students. Get homework help and answers to your toughest questions in math, calculus, algebra, physics, chemistry, science, accounting, English and more. Master your homework assignments with our step-by-step solutions to more than 3000 textbooks. If we don't support your textbook, don't worry! You can ask a homework question and get an answer in as little as two hours. With Chegg, homework help is just a few clicks away.