Propyl acetate is the ester that gives the odor and smell of pears.
e. How many milliliters of a 0.208 M NaOH solution is needed to completely hydrolyze (saponify) 1.58 g of propyl acetate?

Question

Propyl acetate is the ester that gives the odor and smell of pears.

e. How many milliliters of a 0.208 M NaOH solution is needed to completely hydrolyze (saponify) 1.58 g of propyl acetate?

Accepted Answer

Welcome back everyone. Benzyl acetate C nine H 1002 provides jasmine with its characteristic scent, determine the volume in milliliters of a 0.100 molar sodium hydroxide solution required to fully hydrolyze 1.00 g of benzyl acetate. So first of all, let's draw a benzyl acetate. As the name suggests, this is an ester and our parent is acetate. So we're going to draw two carbon atoms starting with carbonyl one and two. And now the alcoy part of the ester is going to have benzoyl as a substituent bonded to oxygen. So we can just state that there is ch two ph because Benzyl essentially is ach two group with the benzene ring or PH, which represents panel as a substituent. And now essentially what we're going to do is perform a reaction with sodium hydroxide. And as we understand, we are performing the hydrolysis of the ether in basic conditions, right? Sodium is an ion spectator hydroxide is responsible for the hydrolysis. And what are we producing? Well, essentially we have to recall that we are producing the carboxylate salt and also we are producing an alcohol. The alcohol comes from the cleavage of the carbon oxygen single bond. So we're just going to draw oxygen ch two ph and then we can simply add hygen to oxygen. What we notice is that this is a 1 to 1 reaction, right? It's already balanced. So we want to use simple psychometry in this problem when we essentially perform the reaction, the number of moles and they must be equal to each other to reach the equivalent point of the reaction. Right, we can say that the number of moles and one for the ester must be equal to the number of moles and two of the base, right? When they are equal to each other, it essentially means that we have completely performed this reaction and we have reached the equivalence point if that was for example, a titration experiment. Now, the number of most of the ester essentially can be calculated in terms of mass because we're given the mass of the ester. And we know that the number of moles is simply the ratio between mass and molar mass. Now, for the solution of sodium hydroxide because it it is a solution, we have to recall that the number of moles is simply a product between molarity and volume. And now looking at those formulas, we can simply state that the mass of the ester divided by its molar mass must be equal to the concentration multiplied by volume because that's what we have previously determined. And since we are solving for the volume of naw, we can rearrange for B and simply see that if we divide both sides by C which is molarity, we arrive at a formula of volume equals mass divided by the product between the molar mass of the ester and the concentration of NAOH So all that we have to do is simply substitute the values the mass of the er is a 1.00 g. What about the molar mass? We can evaluate the molar mass using the given molecular formula. Carbon has an atomic mass of 12.011 g per mole, oxygen has 16. And finally, hydrogen has 1.008 right. So if we add all of those together based on the given subscripts, we arrive at 150.18 g per mole as the molar mass and for the concentration. Well, it's also given 0.100 molar. And when we evaluate the result, we have to be very careful because we're going to get liters and not milliliters. So what we want to do is simply use a conversion factor. Our desired quantity is milliliters. So it goes on top of the conversion factor and we want to get rid of leaders. So it goes on the bottom and we know that 1 mL is 10 to the power of negative third of a liter. So when we perform this whole calculation, we simply arrive at the answer of 66.6 mL of the base needed for this reaction. Thank you for watching.

Propyl acetate is the ester that gives the odor and smell of pears.
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e. How many milliliters of a 0.208 M NaOH solution is needed to completely hydrolyze (saponify) 1.58 g of propyl acetate?

Verified video answer for a similar problem:

Key Concepts

Hydrolysis and Saponification

Molarity and Solution Concentration

Stoichiometry

Propyl acetate is the ester that gives the odor and smell of pears.<IMAGE>e. How many milliliters of a 0.208 M NaOH solution is needed to completely hydrolyze (saponify) 1.58 g of propyl acetate?