A laboratory scientist wants to analyze the chlorogenic acid content of a 0.5 L sample. He uses an indicator solution and titrates with sodium hydroxide. He finds the equivalence point occurs when he's titrated 9.5 mL of 0.05 M sodium hydroxide. Approximately how much chlorogenic acid is in the sample? 475 umol ® 480 umol © 500 umol 510 umol
Answers
Answer:
There are approximately 475 umol of chlorogenic acid in the sample.
Explanation:
The first step is indentifying the chlorogenic acid structure. As it can be seen in the figure attached, this molecule is a carboxylic acid containing just one carboxyl group. This means, that chlorogenic acid is a monoprotic acid and it is only able to donate one proton per molecule or one mol of protons per one mol of molecules.
The second step is to balance the titration equation. Considering that sodium hydroxide will generate one mol of hydroxyl ions per mol of salt, we can simplify the equation:
H⁺ + OH ⁻ → H₂O
Therefore, we now know that for each mol of NaOH consumed 1 mol of chlorogenic acid is titrated.
Thus, the last step is calculation the amount of NaOH consumed during the tritation. We can use the following equation:
In which C is the concentration, n the amount of moles and V the volume.
The result is that n = 475 umol.
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X10%
where x =
0.0960 -
X10%
where x =
Answers
The numbers in scientific notation are 291.7 = 2.917 × 10₂ and 0.0960 = 9.60 × 10⁻².
Scientific notation is commonly used in scientific and mathematical calculations, as well as when dealing with very large or very small numbers. It allows for a more compact and manageable representation of these numbers.
To write the numbers in scientific notation, we need to express them in the form of "a × 10^b," where "a" is a number between 1 and 10, and "b" is an integer.
For the number 291.7, write it in scientific notation as:
291.7 = 2.917 × 10²
For the number 0.0960, write it in scientific notation as:
0.0960 = 9.60 × 10⁻²
To learn more about scientific notation, follow the link:
#SPJ6
Answers
The formula for osmotic pressure is:
where is osmotic pressure,
is van't Hoff's factor,
molarity,
is Ideal gas constant, and T is Temperature.
= 132 atm
The van't Hoff's factor for glucose, = 1
Substituting the values in the above equation we get,
So, the molarity of the solution is .
Answers
Explanation:
Law of conservation of mass states that mass can neither be created nor it can be destroyed but it can be transformed into one form to another.
Similarly, law of conservation of energy states that energy can neither be created nor it can be destroyed as it can only be transformed from one form to another.
In modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions as follows.
For example,
Atomic mass of Na = 23
Atomic mass of Cl = 35
Hence, mass of total number of reactants is calculated as follows.
[(2 \times 23) + (35 \times 2)] g/mol = 116 g/mol
Mass of total number of products is calculated as follows.
[2 \times (23 + 35)] = 116 g/mol
Thus, it is proved that in our modern view of matter and energy, is the law of mass conservation still relevant to chemical reactions.
molar mass of N:
molar mass of O:
and the overall molar mass for Silver Nitrate.
Answers
Answer:
,Molar mass =169.87 g/mol
Explanation:
The systematic name for silver nitrate is
Now we have to calculate the molar mass of
Molar mass of Ag = 107.87 g/mol
Molar mass of N =14 g/mol
Molar mass of O =16 g/mol
So the molar mass of silver nitrate ( ) is
Answers
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, it should be noted that if the containers are compared with an equal average volume, the containers having solids will have larger masses than that containing liquid which will also have a larger mass than that containing gas. This is because solids have there molecules touching each other in compact manner which makes the molecule exert a certain combined force/mass. The molecules of liquid are also close to one another but are not compact like the solids and are hence exerting a lesser force/mass than solids. Gases have free molecules that are far apart and thus are usually the lightest when they occupy the same volume as liquids and solids.